Stat 125 | Mathematics homework help


Q1. Which of the subjoined is penny in-reference-to the sampling disposal of the medium for a big specimen bulk?

   a. It has the similar outline, medium, and gauge hiatus as the population.

   b. It has a recognized disposal delay the similar medium and gauge hiatus as the population.

   c. It has the similar outverse and medium as the population, but has a diminutiveer gauge hiatus.

   d. It has a recognized disposal delay the similar medium as the population but delay a diminutiveer gauge hiatus.

 

Q2. According to a inspect of American commons, the presumption that the residents own 2 cars if annual common proceeds is balance $25,000 is 80%. Of the commons inspected, 60% had proceedss balance $25,000 and 70% had 2 cars. The presumption that annual common proceeds is balance $25,000 if the residents of a common do not own 2 cars is:

   a. 0.12

   b. 0.18

   c. 0.40

   d. 0.55

 

Q3. The collation and summarization of the socioeconomic and tangible characteristics of the employees of a feature secure is an stance of:

   a. hearsay statistics.

   b. picturesquely statistics.

   c. a parameter.

   d. a statistic.

 

Q4. The commander librarian at the Library of Congress has asked her coadjutor for an interim influence of the medium prize of books curbed out each day. The coadjutor stipulates the subjoined interim influence: from 740 to 920 books per day.

 

If the commander librarian distinguishs that the population gauge hiatus is 150 books curbed out per day, and she asked her coadjutor to use 25 days of grounds to invent the interim influence, what belief delineatione can she win to the interim influence?

   a. 99.7%

   b. 99.0%

   c. 98.0%

   d. 95.4%

 

Q5. Referring to the histogram, how sundry graduating influentials animated the luncheon?

 

   a. 4

   b. 152

   c. 275

   d. 388

 

Q6. The subjoined are the durations in minutes of a specimen of covet-interspace phone calls made delayin the continental United States reputed by one covet-interspace conveyance.

 

Time (in Minutes)

Relative Frequency

0 but near than 5

0.37

5 but near than 10

0.22

10 but near than 15

0.15

15 but near than 20

0.10

20 but near than 25

0.07

25 but near than 30

0.07

30 or balance

0.02

 

Referring to the board, if 10 calls latested 30 minutes or balance, how sundry calls latested near than 5 minutes?

   a. 10

   b. 185

   c. 295

   d. 500

 

Q7. The collation of all practicable occurrences is denominated:

   a. a uncompounded presumption.

   b. a specimen interspace.

   c. a articulation presumption.

   d. the trifling set.

 

Q8. A lab signal 100 rats a week for each of the 52 weeks in the year for trials that the lab passs. Prices for 100 rats flourish the subjoined disposal:

 

Price:

$10.00

$12.50

$15.00

Probability:

0.35

0.40

0.25

 

How abundant should the lab budget for instant year's rat signal be, grand this disposal does not exchange?

   a. $520

   b. $637

   c. $650

   d. $780

 

Q9. A adherent of economics at a diminutive Texas university failureed to contrivanceate what year in develop tyros were taking his fibrous economics order. Shown subordinate is a pie chart of the fruits. What percentage of the systematize took the order antecedent to attaining their influential year?

 

   a. 14%

   b. 44%

   c. 54%

   d. 86%

 

Q10. Since a _______ is not a unpremeditatedly chosen presumption specimen, there is no way to distinguish how well-mannered-behaved-behaved-behaved-behaved-behaved it represents the balanceall population.

   a. uncompounded unpremeditated specimen

   b. quota specimen

   c. stratified specimen

   d. collection specimen

 

Q11. A consider is subordinate way in Yosemite Generally-known Wood to contrivanceate the adult crisis of American fade trees. Specifically, the consider is attempting to contrivanceate what factors aid a tree in attaining crisiss ocean than 60 feet towering. It is influenced that the wood comprehends 25,000 adult American fades. The consider involves collecting crisiss from 250 unpremeditatedly chosen adult American fade trees and analyzing the fruits. Identify the population from which the consider was specimend.

   a. The 250 unpremeditatedly chosen adult American fade trees in the wood.

   b. The 25,000 adult American fade trees in the wood.

   c. All the adult American fade trees toweringer than 60 feet in the universe.

   d. All American fade trees, of any age, in the wood.

 

Q12. A population mould for a inspect comprehends a listing of 72,345 names. Using a board of unpremeditated prizes, how sundry digits conciliate the adjudication prizes for each concern of your population comprehend?

   a. 3

   b. 4

   c. 5

   d. 6

 

Q13. The chancellor of a influential university was solicitous environing alcohol abuse on her campus and failureed to perceive out the concern of tyros at her university who visited campus bars entire weekend. Her advisor took a unpremeditated specimen of 250 tyros. The concern of tyros in the specimen who visited campus bars entire weekend is an stance of a __________.

   a. plain unpremeditated fickle

   b. discrete unpremeditated fickle

   c. parameter

   d. statistic

 

Q14. The subjoined are the durations in minutes of a specimen of covet-interspace phone calls made delayin the continental United States reputed by one covet-interspace conveyance.

 

Time (in Minutes)

Relative Frequency

0 but near than 5

0.37

5 but near than 10

0.22

10 but near than 15

0.15

15 but near than 20

0.10

20 but near than 25

0.07

25 but near than 30

0.07

30 or balance

0.02

 

Referring to Board 2-5, if 100 calls were unpremeditatedly specimend, how sundry calls latested 15 minutes or coveter?

   a. 10

   b. 14

   c. 26

   d. 74

 

Q15. If two occurrences are mutually or-laws, what is the presumption that one or the other occurs?

   a. 0

   b. 0.50

   c. 1.00

   d. Cannot be contrivanceated from the instruction attached.

 

Q16. According to a inspect of American commons, the presumption that the residents own 2 cars if annual common proceeds is balance $25,000 is 80%. Of the commons inspected, 60% had proceedss balance $25,000 and 70% had 2 cars. The presumption that the residents of a common do not own 2 cars and enjoy an proceeds balance $25,000 a year is:

   a. 0.12

   b. 0.18

   c. 0.22

   d. 0.48

 

Q17. If two occurrences are mutually or-laws and confusedly debilitating, what is the presumption that one or the other occurs?

   a. 0.

   b. 0.50.

   c. 1.00.

   d. Cannot be contrivanceated from the instruction attached.

 

Q18. Why is the Mediate Limit Theorem so influential to the consider of sampling disposals?

   a. It allows us to silence the bulk of the specimen chosen when the population is not recognized.

   b. It allows us to silence the outverse of the sampling disposal when the bulk of the population is big.

   c. It allows us to silence the bulk of the population we are sampling from.

   d. It allows us to silence the outverse of the population whennis big.

 

Q19. A specimen of 200 tyros at a Big-Ten university was charmed succeeding the midterm to ask them whether they went bar hopping the weekend anteriorly the midterm or late the weekend considering, and whether they did well-mannered-behaved-behaved-behaved-behaved-behaved or unwell-behaved on the midterm. The subjoined board comprehends the fruit.

 

 

Did Well-behaved on Midterm

Did Unwell-behaved on Midterm

Studying for Exam

80

20

Went Bar Hopping

30

70

 

Referring to the board, of those who did well-mannered-behaved-behaved-behaved-behaved-behaved on the midterm in the specimen, _______ percent of them went bar hopping the weekend anteriorly the midterm.

   a. 15

   b. 27.27

   c. 30

   d. 50

 

Q20. Tim was delineationning for a discareer delay his boss to argue a instruct in his annual hire. In making-ready, he failureed to use the Consumer Appraisement Renunciation to contrivanceate the percentage acception in his hire in stipulations of existent proceeds balance the laexamination three years. Which manner of grounds collation was implicated when he used the Consumer Appraisement Index?

   a. Published sources

   b. Experimentation

   c. Surveying

   d. Observation

 

Q21. A inspect was passed to contrivanceate how race trounced the description of programming laborable on television. Respondents were asked to trounce the balanceall description from 0 (no description at all) to 100 (exceedingly cheerful description). The stem-and-leaf exhibit of the grounds is professionn subordinate.

 

Stem

Leaves

3

24

4

3478999

5

112345

6

12566

7

1

8

 

9

2

 

Referring to the board, what percentage of the respondents trounced balanceall television description delay a rating betwixt 50 and 75?

   a. 0.11

   b. 0.40

   c. 0.44

   d. 0.56

 

Q22. The regularity of using specimen statistics to pull disposals environing penny population parameters is denominated:

   a. statistical deduction.

   b. the or-laws manner.

   c. sampling.

   d. picturesquely statistics.

 

Q23. If two resembling relishly occurrences A and B are mutually or-laws and confusedly debilitating, what is the presumption that occurrence A occurs?

   a. 0

   b. 0.50

   c. 1.00

   d. Cannot be contrivanceated from the instruction attached.

 

Q24. Which of the subjoined is most relishly a parameter as divergent to a statistic?

   a. The balance reckoning of the primeval five tyros completing an intrustment.

   b. The proconcern of womanlys registered to suffrage in a county.

   c. The balance crisis of race unpremeditatedly chosen from a groundsbase.

   d. The proconcern of trucks stopped yesterday that were cited for bad brakes.

 

Q25. Selection of raffle tickets from a big bowl is an stance of:

   a. sampling delay retrieval.

   b. sampling delayout retrieval.

   c. intellectual presumption.

   d. None of the aloft.

 

Q26. The portfolio foreseeed retaliate of two boardings

   a. conciliate be remarkable when the codisagreement is naught.

   b. conciliate be remarkable when the codisagreement is denying.

   c. conciliate be remarkable when the codisagreement is decisive.

   d. does not be on the covariance.

 

Q27. Attached the prizes: 1, 3, 5, 7, 8 what are the balance and the median?

   a. Balance = 4.8; Median = 5.0

   b. Balance = 5.0; Median = 5.0

   c. Balance = 4.8; Median = 4.8

   d. Balance = 5.0; Median = 4.8

 

Q28. The employees of a union were inspected on questions in-reference-to their counselal contrast and connubial standing. Of the 600 employees, 400 had instruct extents, 100 were uncombined, and 60 were uncombined instruct graduates. The presumption that an employee of the union is uncombined or has a instruct extent is:

   a. 0.10

   b. 0.25

   c. 0.667

   d. 0.733

 

Q29. A catalog union that receives the influentiality of its signal by telephone passed a consider to contrivanceate how covet customers were conciliateing to rest on rest anteriorly appointing a work. The diffusiveness of spell was root to be a unpremeditated fickle best neard by an exponential disposal delay a medium resembling to 3 minutes. What proconcern of customers having to rest balance than 1.5 minutes conciliate suspend up anteriorly placing an appoint?

   a. 0.86466

   b. 0.60653

   c. 0.39347

   d. 0.13534

 

Q30. The subjoined are the durations in minutes of a specimen of covet-interspace phone calls made delayin the continental United States reputed by one covet-interspace conveyance.

 

Time (in Minutes)

Relative Frequency

0 but near than 5

0.37

5 but near than 10

0.22

10 but near than 15

0.15

15 but near than 20

0.10

20 but near than 25

0.07

25 but near than 30

0.07

30 or balance

0.02

 

Referring to the board, what is the width of each systematize?

   a. 1 minute

   b. 5 minutes

   c. 2%

   d. 100%

 

Q31. The presumption that

·         scion sales conciliate acception in the instant 6 months is influenced to be 0.25.

·         the concern trounces on housing loans conciliate go up in the similar limit is influenced to be 0.74

·         scion sales or concern trounces conciliate go up during the instant 6 months is influenced to be 0.89

The presumption that scion sales conciliate acception but concern trounces conciliate not during the instant 6 months is:

 

   a. 0.065

   b. 0.15

   c. 0.51

   d. 0.89

 

Q32. Which of the medium, median, command, and geometric medium are strong metes of mediate vergency?

   a. The medium and median.

   b. The median and command.

   c. The command and geometric medium.

   d. The medium and command.

 

Q33. The presumption that

·         scion sales conciliate acception in the instant 6 months is influenced to be 0.25

·         the concern trounces on housing loans conciliate go up in the similar limit is influenced to be 0.74

·         scion sales or concern trounces conciliate go up during the instant 6 months is influenced to be 0.89

The presumption that neither scion sales nor concern trounces conciliate acception during the instant 6 months is:

   a. 0.11

   b. 0.195

   c. 0.89

   d. 0.90

 

Q34. Which of the subjoined statistics is not a mete of mediate vergency?

   a. Mean.

   b. Median.

   c. Mode.

   d. Q3.

 

Q35. The width of each bar in a histogram corresponds to the:

   a. dissents betwixt the boundaries of the systematize.

   b. prize of attentions in each systematize.

   c. midsummit of each systematize.

   d. percentage of attentions in each systematize.

 

Q36. In left-skewed disposals, which of the subjoined is the reform announcement?

   a. The interspace from Q1 to Q2 is diminutiveer than the interspace from Q2 to Q3.

   b. The interspace from the diminutiveest attention to Q1 is bigr than the interspace from Q3 to the bigst attention.

   c. The interspace from the diminutiveest attention to Q2 is diminutiveer than the interspace from Q2 to the bigst attention.

   d. The interspace from Q1 to Q3 is twice the interspace from Q1 to Q2.

 

Q37. The Mediate Limit Theorem is influential in statistics because:

   a. for a bign, it says the population is almost recognized.

   b. for any population, it says the sampling disposal of the specimen medium is almost recognized, regardnear of the specimen bulk.

   c. for a bign, it says the sampling disposal of the specimen medium is almost recognized, regardnear of the outverse of the population.

   d. for any bulkd specimen, it says the sampling disposal of the specimen medium is almost recognized.

 

Q38. A specimen of 200 tyros at a Big-Ten university was charmed succeeding the midterm to ask them whether they went bar hopping the weekend anteriorly the midterm or late the weekend considering, and whether they did well-mannered-behaved-behaved-behaved-behaved-behaved or unwell-behaved on the midterm. The subjoined board comprehends the fruit.

 

 

Did Well-behaved on the midterm

Did Unwell-behaved on Midterm

Studying for Exam

80

20

Went Bar Hopping

30

70

 

Referring to the board, _______ percent of the tyros in the specimen went bar hopping the weekend anteriorly the midterm and did well-mannered-behaved-behaved-behaved-behaved-behaved on the midterm.

   a. 15

   b. 27.27

   c. 30

   d. 50

 

Q39. Which of the subjoined announcements environing the median is not penny?

   a. It is balance monstrous by utmost computes than the medium.

   b. It is a mete of mediate vergency.

   c. It is resembling to Q2.

   d. It is resembling to the command in bell-shaped "normal" disposals.

 

Q40. A belief interim was used to influence the proconcern of statistics tyros that are womanlys. A unpremeditated specimen of 72 statistics tyros generated the subjoined 90% belief interim: (0.438, 0.642). Domiciled on the interim aloft, is the population proconcern of womanlys resembling to 0.60?

   a. No, and we are 90% safe of it.

   b. No. The proconcern is 54.17%.

   c. Maybe. 0.60 is a believable compute of the population proconcern domiciled on the instruction aloft.

 

 

Q1. The specimen interrelation coefficient betwixt X and Y is 0.375. It has been root out that the p-compute is 0.256 when ordealing H0: ρ = 0 opposing the two-sided opinion H1: ρ ≠ 0. To ordeal H0: ρ = 0 opposing the one-sided opinion H1: ρ > 0 at a view delineatione of 0.193, the p-compute is
    a. 0.256/2
    b. 0.256
    c. 1 - 0.256
    d. 1 - 0.256/2

Q2. A researcher unpremeditatedly specimend 30 graduates of an MBA program and narrative grounds about their initiateing salaries. Of earliest concern to the researcher was the movables of gender on initiateing salaries. Resolution of the medium salaries of the womanlys and manlys in the specimen is attached subordinate.

Size

Mean

Std Dev

Females

18

48,266.7

13,577.63

Males

12

55,000

11,741.29

Std Untruth = 4,764.82

Means Diff = -6,733.3

Z = -1.4528 2-tailed p compute = 0.1463

T = -1.4221 2-tailed p compute = 0.1574


Referring to the board, the researcher was attempting to profession statistically that the womanly MBA graduates enjoy a speakingly inferior medium initiateing hire than the manly MBA graduates. What boldnesss were certain to pass this supposition ordeal?
    a. Both populations of salaries (manly and womanly) must enjoy near recognized disposals.
    b. The population disagreements are almost resembling.
    c. The specimens were unpremeditatedly and defiantly chosen.
    d. All of the aloft boldnesss were certain.

Q3. The Y-intercept (b0) represents the:
    a. prognosticateed compute of Y when X = 0.
    b. exexvary in influenced balance Y per single exexvary in X.
    c. prognosticateed compute of Y.
    d. exception encircling the specimen requite verse.

Q4. A topical existent lands appraiser irritated the sales appraisements of abodes in 2 neighborhoods to the identical appraised computes of the abodes. The appearance of the resolution was to collate the disposal of sale-to-appraised ratios from abodes in the 2 neighborhoods. Unpremeditated and defiant specimens were chosen from the 2 neighborhoods from laexamination year's abodes sales, 8 from each of the 2 neighborhoods. Identify the nonparametric manner that would be used to irritate the grounds.
    a. the Wilcoxon Signed-Ranks Test, using the ordeal statistic Z
    b. the Wilcoxon Signed-Ranks Test, using the ordeal statistic W
    c. the Wilcoxon Assort Sum Test, using the ordeal statistic T1
    d. the Wilcoxon Assort Sum Test, using the ordeal statistic Z

Q5. A inspect demands that 9 out of 10 doctors commend aspirin for their patients delay commanderaches. To ordeal this demand opposing the opinion that the explicit proconcern of doctors who commend aspirin is near than 0.90, a unpremeditated specimen of 100 doctors fruits in 83 who declare that they commend aspirin. The compute of the ordeal statistic in this bearing is almost resembling to:
    a. -4.12
    b. -2.33
    c. -1.86
    d. -0.07

Q6. A existenttor failures to collate the balance sales-to-appraisal ratios of residential properties sold in indelicate neighborhoods (W, X, Y, and Z). Indelicate properties are unpremeditatedly chosen from each neighborhood and the ratios narrative for each, as professionn subordinate. 

W: 1.2, 1.1, 0.9, 0.4
X: 2.5, 2.1, 1.9, 1.6
Y: 1.0, 1.5, 1.1, 1.3
Z: 0.8, 1.3, 1.1, 0.7

Interpret the fruits of the resolution summarized in the subjoined board: 

Source

df

SS

MS

F

PR > F

Neighborhoods

2.97

0.990

8.31

0.0260

 

Error

12

    

Total

4.40

    

Referring to the board, the delayin collection medium balances is
    a. 0.119
    b. 0.990
    c. 1.109
    d. 8.31

Q7. If a collection of defiant fickles are not speaking scantly but are speaking as a collection at a exact delineatione of view, this is most relishly due to:
    a. autocorrelation.
    b. the closeness of dummy fickles.
    c. the neglect of dummy fickles.
    d. collinearity.

Q8. In a multiple requite commandl, the adjusted r2
    a. cannot be denying.
    b. can casually be denying.
    c. can casually be ocean than +1.
    d. has to descend betwixt 0 and +1.

Q9. Why would you use the Tukey-Kramer way?
    a. To ordeal for recognizedity.
    b. To ordeal for ratio of disagreement.
    c. To ordeal anarchy of untruths.
    d. To ordeal for dissents in pairwise mediums.

Q10. A campus researcher failureed to defy the factors that influence usurper expedition spell in a abstruse, multiplane structure on campus. Specifically, he failureed to contrivanceate whether opposed structure signs (structure maps versus mole signage) influence the entirety whole of spell usurpers exact to attain their summit and whether that spell bes on whether the initiateing dregs is internally or delayout the structure. Three matters were intrusted to each of the combinations of signs and initiateing dregss, and expedition spell in seconds from publicing to summit was narrative. How should the grounds be irritated? 

 

Starting Room

 

Interior

Exterior

Wall Signs

141

224

119

339

238

139

Map

85

226

94

129

126

130


    a. Completely unpremeditatedized contrivance
    b. Randomized fill contrivance
    c. 2 x 2 factorial contrivance
    d. Kruskal-Wallis assort ordeal

Q11. As a profession statistics delineation, a tyro examined the factors that contrivanceate circleing meter trounces throughout the campus and downtown area. The campus is a collection of structures located in the hardihood of downtown, delay an public mediate quadrangle. Grounds were cool for the appraisement of circleing per hour and the prize of fills to the quadrangle. In importation, two dummy fickles were adjudicationd to declare the dregs of the circleing meter (See subordinate). The population requite commandl hypothesized is 

Yi = ß0 + ß1x1i + ß2x2i + ß3x3i + ei 

where 
Y is the appraisement per hour
x1 is a numerical fickle = the prize of fills to the quadrangle
(Note that if x1 is near than 2, then the meter is on campus; if x1 is near than 3, then the meter is downtown)
x2 is a dummy fickle = 1 if internally downtown and off campus, 0 otherwise
x3 is a dummy fickle = 1 if delayout downtown and off campus, 0 otherwise 

The subjoined Excel fruits are obtained. 

Regression Statistics

Multiple R

9.9659

R Square

0.9331

Adjusted R Square

0.9294

Standard Error

0.0327

Observations

58

ANOVA

df

SS

MS

F

Signif F

Regression

3

0.8094

0.2698

251.1995

1.0964E-31

Residual

54

0.0580

0.0010

  

Total

57

0.8675

   

Coeff

StdError

t Stat

P-value

Intercept

0.5118

0.0136

37.4675

2.4904

X1

-0.0045

0.0034

-1.3275

0.1898

X2

-0.2392

0.0123

-19.3942

5.3581E-26

X3

-0.0002

0.0123

-0.0214

0.9829

Referring to the boards, prognosticate the meter trounce per hour if one circles delayout of downtown and off campus, 3 fills from the quad. 
    a. $-0.0139
    b. $0.2589
    c. $0.2604
    d. $0.4981

Q12. If we use the chi-squared manner of resolution to ordeal for the dissents unarranged 4 interrelations, the extents of immunity are resembling to:
    a. 3
    b. 4
    c. 5
    d. 1

Q13. An economist is concerned to see how closeening for an rule (in $ billions) is influenced by entire privy work ($ billions) and example appraisement (consumer appraisement renunciation). The Microsoft Excel output of this requite is scantly reeffected subordinate.

SUMMARY OUTPUT

Regression Statistics

Multiple R

0.991

R Square

0.982

Adjusted R Square

0.976

Standard Error

0.299

Observations

10

ANOVA

df

SS

MS

F

Signif F

Regression

2

33.4163

16.7082

186.325

0.0001

Residual

7

0.6277

0.0897

  

Total

9

34.0440

   

Coeff

StdError

t Stat

P-value

Intercept

-0.0861

0.5674

-0.152

0.8837

GDP

0.7654

0.0574

13.340

0.0001

Price

-0.0006

0.0028

-0.219

0.8330

Referring to the boards, one rule in the specimen had an example closeening delineatione of $4 billion, a GDP of $6 billion, and an example appraisement delineatione of 200. What is the residual for this grounds summit? 
    a. $4.39 billion
    b. $0.39 billion
    c. -$0.39 billion
    d. -$1.33 billion

Q14. Testing for the creature of interrelation is equiponderant to
    a. ordealing for the creature of the expand (β1).
    b. ordealing for the creature of the Y-intercept (β0).
    c. the belief interim influence for prognosticateing Y.
    d. ordealing for the creature of the expand (β10).

Q15. As a profession statistics delineation, a tyro examined the factors that contrivanceate circleing meter trounces throughout the campus and downtown area. The campus is a collection of structures located in the hardihood of downtown, delay an public mediate quadrangle. Grounds were cool for the appraisement of circleing per hour and the prize of fills to the quadrangle. In importation, two dummy fickles were adjudicationd to declare the dregs of the circleing meter (See subordinate). The population requite commandl hypothesized is 

Yi = ß0 + ß1x1i + ß2x2i + ß3x3i + ei 

where 
Y is the appraisement per hour
x1 is a numerical fickle = the prize of fills to the quadrangle
(Note that if x1 is near than 2, then the meter is on campus; if x1 is near than 3, then the meter is downtown)
x2 is a dummy fickle = 1 if internally downtown and off campus, 0 otherwise
x3 is a dummy fickle = 1 if delayout downtown and off campus, 0 otherwise 

The subjoined Excel fruits are obtained. 

Regression Statistics

Multiple R

9.9659

R Square

0.9331

Adjusted R Square

0.9294

Standard Error

0.0327

Observations

58

ANOVA

df

SS

MS

F

Signif F

Regression

3

0.8094

0.2698

251.1995

1.0964E-31

Residual

54

0.0580

0.0010

  

Total

57

0.8675

   

Coeff

StdError

t Stat

P-value

Intercept

0.5118

0.0136

37.4675

2.4904

X1

-0.0045

0.0034

-1.3275

0.1898

X2

-0.2392

0.0123

-19.3942

5.3581E-26

X3

-0.0002

0.0123

-0.0214

0.9829

Referring to the boards, if one is already delayout of downtown and off campus but decides to circle an importational 3 fills from the quadrangle, the influenced balance circleing meter trounce conciliate: 
    a. diminish by 0.0045.
    b. diminish by 0.0135.
    c. diminish by 0.0139.
    d. diminish by 0.4979.

Q16. The subjoined EXCEL output comprehends the fruits of a ordeal to contrivanceate if the interrelations of amiable guests at two resorts are the similar or opposed. 

Hypothesized Difference0
Level of View 0.05
Group 1
Number of Successes163
Sample Size227
Group 2
Number of Successes154
Sample Size262
Group 1 Proportion0.718061674
Group 2 Proportion0.58778626
Difference in Two Proportions 0.130275414
Average Proportion0.648261759
Test Statistic3.00875353
Two-Tailed Test
Lower Crucial Compute -1.959961082
Upper Crucial Compute 1.959961082
p-Value 0.002623357

Referring to the grounds aloft, if you failure to ordeal the demand that "Resort 1 (Group 1) has a higher proconcern of amiable guests collated to Resort 2 (Group 2)," the p-compute of the ordeal conciliate be
    a. 0.00262
    b. 0.00262/2
    c. 2*(0.00262)
    d. 1 - (0.00262/2)

Q17. A existent lands builder wishes to contrivanceate how scion bulk (House) is influenced by source proceeds (Income), source bulk (Size), and counsel of the commander of common (School). Scion bulk is meted in hundreds of balance feet, proceeds is meted in thousands of dollars, and counsel is in years. The builder unpremeditatedly chosen 50 families and ran the µltiple requite. Microsoft Excel output is granted subordinate:

SUMMARY OUTPUT

Regression Statistics

Multiple R

0.865

R Square

0.748

Adjusted R Square

0.726

Standard Error

5.195

Observations

50

ANOVA

df

SS

MS

F

Signif F

Regression

3605.7736

901.4434

0.0001

  

Residual

1214.2264

26.9828

   

Total

49

4820.0000

   

Coeff

StdError

t Stat

P-value

Intercept

-1.6335

5.8078

-0.281

0.7798

Income

0.4485

0.1137

3.9545

0.0003

Size

4.2615

0.8062

5.286

0.0001

School

-0.6517

0.4319

-1.509

0.1383

Referring to the boards, one single in the specimen had an annual proceeds of $10,000, a source bulk of 1, and an counsel of 8 years. This single owned a abode delay an area of 1,000 balance feet (House = 10.00). What is the residual (in hundreds of balance feet) for this grounds summit?
    a. 8.10
    b. 5.40
    c. -5.40
    d. -8.10

Q18. A balanceseer of a work sales collection believes the prize of sales made by an employee (Y) bes on how sundry years that employee has been delay the union (X1) and how he/she reckoningd on a profession liability ordeal (X2). A unpremeditated specimen of 8 employees stipulates the subjoined: 

Employee

Y

X1

X2

1

100

10

7

2

90

3

10

3

80

8

9

4

70

5

4

5

60

5

8

6

50

7

5

7

40

1

4

8

30

1

1

Referring to the board, for these grounds, what is the influenced coefficient for the fickle representing years an employee has been delay the union, b1?
    a. 0.998
    b. 3.103
    c. 4.698
    d. 21.293

Q19. In ordealing for dissents betwixt the mediums of 2 defiant populations, the trifling supposition is:
    a. H0: μ1 - μ2 = 2.
    b. H0: μ1 - μ2 = 0.
    c. H0: μ1 - μ2 > 0.
    d. H0: μ1 - μ2 < 2.

Q20. A balanceseer of a work sales collection believes the prize of sales made by an employee (Y) bes on how sundry years that employee has been delay the union (X1) and how he/she reckoningd on a profession liability ordeal (X2). A unpremeditated specimen of 8 employees stipulates the subjoined: 

Employee

Y

X1

X2

1

100

10

7

2

90

3

10

3

80

8

9

4

70

5

4

5

60

5

8

6

50

7

5

7

40

1

4

8

30

1

1

Referring to Board 14-1, for these grounds, what is the influenced coefficient for the fickle representing reckonings on the liability ordeal, b2?A balanceseer of a work sales collection believes the prize of sales made by an employee (Y) bes on how sundry years that employee has been delay the union (X1) and how he/she reckoningd on a profession liability ordeal (X2). A unpremeditated specimen of 8 employees stipulates the subjoined: 

Employee

Y

X1

X2

1

100

10

7

2

90

3

10

3

80

8

9

4

70

5

4

5

60

5

8

6

50

7

5

7

40

1

4

8

30

1

1

Referring to the board, what is the influenced coefficient for the fickle representing reckonings on the liability ordeal, b2?
    a. 0.998
    b. 3.103
    c. 4.698
    d. 21.293

Q21. To ordeal the movabshort of a profession develop making-ready order, 8 tyros took a public profession ordeal anteriorly and succeeding the order. The fruits are attached subordinate. 

Student

Exam Reckoning Anteriorly Course

Exam Reckoning Succeeding Course

1

530

670

2

690

770

3

910

1,000

4

700

710

5

450

550

6

820

870

7

820

770

8

630

610

Referring to the board, at the 0.05 delineatione of view, the disposal for this supposition ordeal would be:
    a. the profession develop making-ready order does reform exam reckoning.
    b. the profession develop making-ready order does not reform exam reckoning.
    c. the profession develop making-ready order has no contact on exam reckoning.
    d. It cannot be pulln from the instruction attached.

Q22. If the p compute is near than α in a two-tailed ordeal,
    a. the trifling supposition should not be exceptional.
    b. the trifling supposition should be exceptional.
    c. a one-tailed ordeal should be used.
    d. no disposal should be attained.

Q23. If the Type I untruth (α) for a attached ordeal is to be diminishd, then for a unwandering specimen bulk n
    a. the Type II untruth (β) conciliate also diminish.
    b. the Type II untruth (β) conciliate acception.
    c. the susceptibility of the ordeal conciliate acception.
    d. a one-tailed ordeal must be utilized.

Q24. Psychologists enjoy root that race are publicly loth to despatch bad tidings to their peers.
This phenomenon has been termed the "MM movables." To defy the motive of the MM movables, 40 subordinategraduates
at Duke University sundericipated in an trial. Each matter was asked to bring an IQ ordeal to another tyro
and then stipulate the ordeal taker delay his or her percentile reckoning. Unknown to the matter, the ordeal taker was a bogus
tyro who was inaugurated delay the researchers. The trialers manipulated two factors: matter examination and
good-fortune of ordeal taker, each at two delineationes. Matter examination was either clear or not clear to the ordeal taker. Good-fortune of
the ordeal taker was either clear or not clear to the ordeal taker. Good-fortune of the ordeal taker was either
top 20% or floor 20%. Ten matters were unpremeditatedly intrusted to each of the 2 x 2 = 4 trialal stipulations, then
the spell (in seconds) betwixt the end of the ordeal and the delivery of the percentile reckoning from the matter to the ordeal
taker was meted. (This fickle is denominated the latency to feedback.) The grounds were mattered to expend analyses
delay the subjoined fruits. 

Source

df

SS

MS

F

PR > F

Subject examination

1

1380.24

1380.24

4.26

0.043

Test taker good-fortune

1

1325.16

1325.16

4.09

0.050

Interaction

1

3385.80

3385.80

10.45

0.002

Error

36

11,664.00

324.00

  

Total

39

17,755.20

   

Referring to the board, in the texture of this consider, understand the announcement: "Subject examination and ordeal taker good-fortune interact." 
    a. The dissent betwixt the medium feedback spell for clear and nonclear matters bes on the good-fortune of the ordeal taker.
    b. The dissent betwixt the medium feedback spell for ordeal takers scoring in the top 20% and floor 20% bes on the examination of the matter.
    c. The kindred betwixt feedback spell and matter examination bes on the good-fortune of the ordeal taker.
    d. All of the aloft are reform understandations.

Q25. A candy bar manufacturer is concerned in obscure to influence how sales are influenced by the appraisement of their work. To do this, the union unpremeditatedly chooses 6 diminutive cities and offers the candy bar at opposed appraisements. Using candy bar sales as the beent fickle, the union conciliate pass a uncompounded versear requite on the grounds subordinate: 

City

Price ($)

Sales

River Falls

1.30

100

Hudson

1.60

90

Ellsworth

1.80

90

Prescott

2.00

40

Rock Elm

2.40

38

Stillwater

2.90

32

Referring to the board, what is the coefficient of interrelation for these grounds?
    a. -0.8854
    b. -0.7839
    c. 0.7839
    d. 0.8854

Q26. A ____________ is a numerical portion computed from the grounds of a specimen and is used in attaining a resolution on whether or not to refuse the trifling supposition.
    a. view delineatione
    b. crucial compute
    c. ordeal statistic
    d. parameter

Q27. An boarding specialist demands that if one rests a portfolio that moves in inconsistent order to the negotiate renunciation relish the S&P 500, then it is practicable to subdue the variability of the portfolio's retaliate. In other articulation, one can imagine a portfolio delay decisive retaliates but near exposafe to miss.

A specimen of 26 years of S&P 500 renunciation and a portfolio consisting of funds of privy prisons, which are believed to be denyingly kindred to the S&P 500 renunciation, is cool. A requite resolution was done by regressing the retaliates of the prison funds portfolio (Y) on the retaliates of S&P 500 renunciation (X) to make-trial-of that the privy prisons fund portfolio is denyingly kindred to the S&P 500 renunciation at a 5% delineatione of view. The fruits are attached in the subjoined EXCEL output.

Coefficients

Standard Error

T Stat

P-value

Intercept

4.866004258

0.35743609

13.61363441

8.7932E-13

S&P

-0.502513506

0.071597152

-7.01862425

2.94942E-07

Referring to the board, which of the subjoined conciliate be a reform disposal?
    a. We cannot refuse the trifling supposition and, hence, complete that there is correspondent illustration to profession that the prison fund portfolio and S&P 500 renunciation are denyingly kindred.
    b. We can refuse the trifling supposition and, hence, complete that there is correspondent illustration to profession that the prison fund portfolio and S&P 500 renunciation are denyingly kindred.
    c. We cannot refuse the trifling supposition and, hence, complete that there is not correspondent illustration to profession that the prison fund portfolio and S&P 500 renunciation are denyingly kindred.
    d. We can refuse the trifling supposition and complete that there is not correspondent illustration to profession that the prison fund portfolio and S&P 500 renunciation are denyingly kindred.

Q28. One proof used to evaluate employees in the galaxy minority of a big factory is the prize of imperfect pieces per 1,000 sunders pied. The description administer branch failures to perceive out whether there is a kindred betwixt years of proof and imperfection trounce. Since the job is repetitious, succeeding the judicious grafting limit any reformment due to a literature movables ability be offset by a waste of motivation. A imperfection trounce is adapted for each worker in a year-by-year evaluation. The fruits for 100 workers are attached in the board subordinate. 

Years Since Grafting Period

< 1 Year

1 - 4 Years

5 - 9 Years

Defect Rate

High

6

9

9

Average

9

19

23

Low

7

8

10

Referring to the board, perceive the refuseion territory certain for ordealing at the 0.05 delineatione of view whether there is a kindred betwixt imperfection trounce and years of proof.
    a. Reject H0 if chi-balance > 16.919 
    b. Reject H0 if chi-balance > 15.507 
    c. Reject H0 if chi-balance > 11.143 
    d. Reject H0 if chi-balance > 9.488 

Q29. A campus researcher failureed to defy the factors that influence usurper expedition spell in a abstruse, multiplane structure on campus. Specifically, he failureed to contrivanceate whether opposed structure signs (structure maps versus mole signage) influence the entirety whole of spell usurpers exact to attain their summit and whether that spell bes on whether the initiateing dregs is internally or delayout the structure. Three matters were intrusted to each of the combinations of signs and initiateing dregss, and expedition spell in seconds from publicing to summit was narrative. An Excel output of the expend resolution is attached subordinate: 

ANOVA

Source of Variation

SS

df

MS

F

P-value

F crit

Signs

14008.33

14008.33

0.11267

5.317645

  

Starting Location

12288

2.784395

0.13374

5.317645

  

Interaction

48

48

0.919506

5.317645

  

Within

35305.33

4413.167

    

Total

61649.67

11

    

Referring to the board, the delayin (error) extents of immunity is
    a. 1
    b. 4
    c. 8
    d. 11

Q30. If we wish to contrivanceate whether there is illustration that the proconcern of good-fortunees is remarkable in collection 1 than in collection 2, the expend ordeal to use is
    a. the Z test.
    b. the chi-squared ordeal.
    c. the W test.
    d. the X test.

Q31. A researcher unpremeditatedly specimend 30 graduates of an MBA program and narrative grounds about their initiateing salaries. Of earliest concern to the researcher was the movables of gender on initiateing salaries. Resolution of the medium salaries of the womanlys and manlys in the specimen is attached subordinate.

Size

Mean

Std Dev

Females

18

48,266.7

13,577.63

Males

12

55,000

11,741.29

Std Untruth = 4,764.82

Means Diff = -6,733.3

Z = -1.4528 2-tailed p compute = 0.1463

T = -1.4221 2-tailed p compute = 0.1574


Referring to the board, the researcher was attempting to profession statistically that the womanly MBA graduates enjoy a speakingly inferior medium initiateing hire than the manly MBA graduates. From the resolution in the board, the reform ordeal statistic is:
    a. 4,634.72
    b. -1.4221
    c. -1.4528
    d. -6,733.33

Q32. If we are performing a two-tailed ordeal of whether μ = 100, the presumption of detecting a alter of the medium to 105 conciliate be ________ the presumption of detecting a alter of the medium to 110.
    a. near than
    b. ocean than
    c. resembling to
    d. not similar to

Q33. Parents pain that outcome decipher too few storybooks and wait too µch television nowadays. A inspect of 1,000 outcome reveals the subjoined instruction on balance spell late waiting TV and balance spell late deciphering storybooks

Average spell late deciphering storybooks

Average spell
late waiting TV

Less than
1 hour

Between
1 and 2 hours

More than
2 hours

Less than 2 hours

90

85

130

More than 2 hours

655

32

8

Referring to the board, to ordeal whether there is any kindred betwixt balance spell late waiting TV and balance spell late deciphering storybooks, the compute of the meted ordeal statistic is:
    a. -12.59
    b. 1.61
    c. 481.49
    d. 1,368.06

Q34. A big generally-known bank score topical companies for using their labors. A bank negotiative reputed the fruits of a requite resolution calculated to prognosticate the bank's score (Y) -- meted in dollars per month -- for labors rendered to topical companies. One defiant fickle used to prognosticate labor advise to a union is the union's sales income (X) -- meted in darlings of dollars. Grounds for 21 companies who use the bank's labors were used to fit the commandl: 

E(Y) = ß0 + ß1

The fruits of the uncompounded versear requite are granted subordinate. 

Y = -2,700+20X, syx = 65, two-tailed p compute = 0.034 (for ordealing ß1

Referring to Board 13-1, understand the p compute for ordealing whether ß1 exceeds 0.
    a. There is correspondent illustration (at the α = 0.05) to complete that sales income (X) is a conducive versear prognosticateor of labor advise (Y).
    b. There is incorrespondent illustration (at the α = 0.10) to complete that sales income (X) is a conducive versear prognosticateor of labor advise (Y).
    c. Sales income (X) is a penniless prognosticateor of labor advise (Y).
    d. For entire $1 darling acception in sales income, we foresee a labor advise to acception $0.034.

Q35. A consider published in the American Journal of Public Health was passed to contrivanceate whether the use of stud encompasss in motor vehicles bes on ethnic standing in San Diego County. A specimen of 792 outcome treated for injuries sustained from motor vehicle surroundingss was obtained, and each branch was systematizeified according to (1) ethnic standing (Hispanic or non-Hispanic) and (2) stud encompass performance (barren or not barren) during the surroundings. The prize of outcome in each predicament is attached in the board subordinate. 

Hispanic

Non-Hispanic

Seat encompasss barren

31

148

Seat encompasss not barren

283

330

Referring to the board, which ordeal would be used to uprightly irritate the grounds in this trial? 
    a. chi-square ordeal for anarchy in a two-way affluence board.
    b. chi-square ordeal for resembling interrelations in a one-way board. 
    c. ANOVA F ordeal for interaction in a 2 x 2 factorial contrivance.
    d. chi-square ordeal for a 2 x 2 factorial contrivance. 

Q36. The Journal of Profession Venturing reputed on the activities of entrepreneurs during the construction invention regularity. As sunder of a calculated consider, a entirety of 71 entrepreneurs were interviewed and divided into 3 collections: those that were good-fortuneful in rooting a new secure (n1 = 34), those quiescent actively obscure to institute a secure (n2 = 21), and those who covered to initiate a new secure but occurrenceually gave up (n3 = 16). The entirety prize of activities subordinatecharmed (e.g., plain a profession delineation, sought funding, looked for facilities) by each collection balance a exact spell limit during construction invention was meted. The concrete is to collate the medium prize of activities of the 3 collections of entrepreneurs. Bemotive of concerns balance certain boldness of the parametric resolution, it was particularized to use a nonparametric resolution. Identify the nonparametric manner that would be used to irritate the grounds.
    a. Wilcoxon Assort Sums Test
    b. Wilcoxon Signed Assort Test
    c. Kruskal-Wallis Assort Ordeal for Differences in Medians
    d. One-way ANOVA F ordeal

Q37. A researcher unpremeditatedly specimend 30 graduates of an MBA program and narrative grounds about their initiateing salaries. Of earliest concern to the researcher was the movables of gender on initiateing salaries. Resolution of the medium salaries of the womanlys and manlys in the specimen is attached subordinate.

Size

Mean

Std Dev

Females

18

48,266.7

13,577.63

Males

12

55,000

11,741.29

Std Untruth = 4,764.82

Means Diff = -6,733.3

Z = -1.4528 2-tailed p compute = 0.1463

T = -1.4221 2-tailed p compute = 0.1574


Referring to the board, the researcher was attempting to profession statistically that the womanly MBA graduates enjoy a speakingly inferior medium initiateing hire than the manly MBA graduates. According to the ordeal run, which of the subjoined is an expend opinion supposition?
    a. H1: μfemales > μmales
    b. H1: μfemales < μmales
    c. H1: μfemales ≠ μmales
    d. H1: μfemales = μmales

Q38. A computer used by a 24-hour banking labor is deemed to unpremeditatedly intrust each performance to one of 5 fame dregss. A curb at the end of a day's performances gave the counts professionn in the board to each of the 5 fame dregss, acovet delay the prize of reputed untruths. 

Memory Location:

1

2

3

4

5

Number of Transactions:

82

100

74

92

102

Number of Reputed Errors

11

12

6

9

10

 

The bank balanceseer failureed to ordeal whether the proconcern of untruths in performances intrusted to each of the 5 fame dregss disagree. Referring to the board, which ordeal would be used to uprightly irritate the grounds in this trial?
    a. chi-square ordeal for anarchy in a two-way affluence board 
    b. chi-square ordeal for resembling interrelations in a one-way board 
    c. ANOVA F ordeal for ocean texture movables
    d. Z ordeal for the dissent in two interrelations

Q39. If a ordeal of supposition has a Type I untruth presumption (α) of 0.01, we medium
    a. if the trifling supposition is penny, we don't refuse it 1% of the spell.
    b. if the trifling supposition is penny, we refuse it 1% of the spell.
    c. if the trifling supposition is falsity, we don't refuse it 1% of the spell.
    d. if the trifling supposition is falsity, we refuse it 1% of the spell.

Q40. The subjoined EXCEL output comprehends the fruits of a ordeal to contrivanceate if the interrelations of amiable guests at two resorts are the similar or opposed. 

Hypothesized Dissent 0
Level of View 0.05
Group 1
Number of Successes 163
Sample Bulk 227
Group 2
Number of Successes 154
Sample Bulk 262
Group 1 Proconcern 0.718061674
Group 2 Proconcern 0.58778626
Difference in Two Proportions 0.130275414
Average Proconcern 0.648261759
Test Statistic 3.00875353
Two-Tailed Test
Lower Crucial Compute -1.959961082
Upper Crucial Compute 1.959961082
p-Value 0.002623357

Referring to the board, if you failure to ordeal the demand that "Resort 1 (Group 1) has a higher proconcern of amiable guests collated to Resort 2 (Group 2)," the p-compute of the ordeal conciliate be 
    a. 0.00262 
    b. 0.00262/2 
    c. 2*(0.00262) 
    d. 1 - (0.00262/2)