Stat201 midterm exam 40/40 | Mathematics homework help


•Question 1

3 out of 3 points

 

Which is a conclude for using a log flake for interval achievemention facts?

.  

It helps parallel augmentation in interval achievemention of remote magnitude

.  

It helps parallel augmentation in interval achievemention of remote magnitude

General profession audiences perceive it easier to explain a log flake

On a log flake, correspondent distances illustreprove correspondent dollar amounts

The axis labels are usually easier to discover in log units

 

•Question 2

3 out of 3 points

 

We would helpmate the signal auricular statistics after a occasion which work?

.  

Estimating unrecognized parameters

.Making visual displays of facts

 

Estimating unrecognized parameters

Describing a pattern of facts

Tabulating a overlook

 

•Question 3

3 out of 3 points

 

A abundance histogram should be computed from which archearcheemblem of facts?

.  

Quantitative facts

.  

Quantitative facts

Categorical facts

Nominal smooth facts

Ordinal facts

 

 

•Question 4

3 out of 3 points

 

The sum of hardy babies in a pattern of 10 purposelessly chosen babies is a:

.  

binomial purposehither inconstant

.uniform purposehither inconstant

Poisson purposehither inconstant

binary purposehither inconstant

 

binomial purposehither inconstant

 

•Question 5

3 out of 3 points

 

A examine is lower way in Yosemite National Jungle to state the adult loftyness of American fade trees. Specifically, the examine is attempting to state what factors aid a tree in reaching loftynesss greater than 60 feet lofty. It is estimated that the jungle contains 25,000 adult American fades. The examine involves collecting loftynesss from 250 purposelessly clarified adult American fade trees and analyzing the results. Identify the pattern in the examine.

.  

The 250 purposelessly clarified adult American fade trees.

.  

The 250 purposelessly clarified adult American fade trees.

The 25,000 adult American fade trees in the jungle.

All the adult American fade trees loftyer than 60 feet.

All American fade trees, of any age, in the jungle.

 

•Question 6

3 out of 3 points

 

An bombardment decided reproves bonds for AardCo Inc. as "B+" occasion bonds of Deva Corp. are reproved "AA." Which smooth of measurement would be expend for such facts?

.  

Ordinal

.Nominal

 

Ordinal

Interval

Ratio

 

•Question 7

3 out of 3 points

 

Researchers are watchful that the ponderosity of the mediocre American teach cadet is increasing implying, unarranged other things, that cadetren's investment should be contrived and marketed in ampler extents. If X is the ponderosity of teach cadetren patternd in a nationwide examine, then X is an pattern of

.  

a uniform purposehither inconstant.

.a demonstrative purposehither inconstant.

a discrete purposehither inconstant.

 

a uniform purposehither inconstant.

a parameter.

 

•Question 8

3 out of 3 points

 

When comparing facts measured by substantially divergent flakes, we must use

.  

standardized facts appraises.

.  

standardized facts appraises.

standardized facts flakes.

standardized facts variations.

standardized facts scores.

 

•Question 9

3 out of 3 points

 

A association has 2 mediums that product widgets. An older medium products 23% faulty widgets, occasion the new medium products solely 8% faulty widgets. In abstracted, the new medium products 3 intervals as abundant widgets as the older medium does. Dedicated that a widget was productd by the new medium, what is the verisimilitude it is not faulty?

.  

0.92

.0.06

0.50

 

0.92

0.94

 

•Question 10

3 out of 3 points

 

Which is last slight to be guarded as a homogeneity inconstant?

.  

A critic's rating of a restaurant on a 1 to 4 flake

.  

A critic's rating of a restaurant on a 1 to 4 flake

Automobile lavish oration of nitrogen dioxide (milligrams per mile)

Number of customer complaints per day at a cable TV association office

Cost of an e-Bay escheatment

 

•Question 11

3 out of 3 points

 

Based on a overlook of 400 wards in a university in which 20 percent implied that they were profession mains. The university ward newspaper mented that "20 percent of all the wards at the university are profession mains." This ment is an pattern of

.  

statistical conclusion.

.a pattern.

a population.

 

statistical conclusion.

descriptive statistics.

 

•Question 12

3 out of 3 points

 

"Bob must be deep. He's a attorney, and attorneys compel lots of coin." This announcement best illustrates which fiction?

.  

Generalizing from an mediocre to an individual

.Using meagre overlook methods

Confusing reason after a occasion importance

Unconscious bias

 

Generalizing from an mediocre to an individual

 

•Question 13

3 out of 3 points

 

In a assured city, 5 percent of all drivers entertain expired indulges, 10 percent entertain an unpaid parking ticket, and 1 percent entertain twain an expired indulge and an unpaid parking ticket. Are these events refractory?

.  

No

.  

No

Yes

Can’t decide from dedicated knowledge

 

•Question 14

3 out of 3 points

 

Retailers are frequently zealous in determining why a customer clarified their hoard to compel a escheatment. A sporting movables retailer conducted a customer overlook to state why its customers shopped at the hoard. The results are shown in the bar chart underneath. What uniformity of the customers responded that they shopped at the hoard owing of the goods or the opportunity?

 

.  

65%

.35%

50%

 

65%

85%

 

•Question 15

3 out of 3 points

 

Which of the aftercited is penny after a occasion regard to the binomial rankification?

.  

The binomial rankification tends to be over symmetric as p approaches 0.5.

.As the pattern extent increases, the expected appraise of the purposehither insteady decreases.

The binomial rankification becomes over skewed as the pattern extent is increased for a dedicated verisimilitude of achievement.

 

The binomial rankification tends to be over symmetric as p approaches 0.5.

In ordain for the binomial rankification to be skewed, the pattern extent must be completely ample.

 

•Question 16

3 out of 3 points

 

Based on the tentative government we can take that all rankifications entertain borderly 95 percent of the appraises after a occasionin ± 2 scale flexuositys of the mediocre.

.  True

.  True

False

 

•Question 17

3 out of 3 points

 

The purposehither insteady X

is the sum of shots it takes anteriorly you compel the chief gratuitous propel in basketball. Assuming the verisimilitude of achievement (making a gratuitous propel) is steady from attempt to attempt, what archearcheemblem of rankification does X

follow?

.  

Geometric

.Binomial

Poisson

Hypergeometric

 

Geometric

 

•Question 18

3 out of 3 points

 

Which is not considered a faithhither graphical technique?

.  

Axis demarcations

.Nonzero origin

Elastic graph uniformitys

Dramatic title

 

Axis demarcations

 

•Question 19

3 out of 3 points

 

We would use a pivot consultation to:

.  

cross-tabulate frequencies of transaction of two inconstants

.  

cross-tabulate frequencies of transaction of two inconstants

rotate the facts about a accessible point

establish cause-and-effect betwixt X and Y

display the facts in a 3D disseminate plot

 

•Question 20

3 out of 3 points

 

The expected appraise of a discrete purposehither insteady E(X) is the sum of all X appraises ponderosityed by their regardive probabilities.

.  True

.  True

False

 

•Question 21

3 out of 3 points

 

A die is rolled. If it rolls to a 1, 2, or 3 you win $2. If it rolls to a 4, 5, or 6 you induce $1. Perceive the expected winnings.

.  

$0.50

.  

$0.50

$3.00

$1.50

$1.00

 

•Question 22

3 out of 3 points

 

If cars attain to a employment disposition purposelessly and refractoryly at a reprove of 5 per hour on mediocre, what is the verisimilitude that accurately 5 cars allure attain during a dedicated hour?

.  

0.1755

.  

0.1755

0.6160

0.1277

Essentially zero

 

•Question 23

3 out of 3 points

 

A purposehither insteady is binomially distributed after a occasion n = 16 and pi = .40. The expected appraise and scale flexuosity of the inconstants are:

.  

6.40 and 1.96

.2.00 and 1.24

4.80 and 4.00

 

6.40 and 1.96

2.00 and 1.20

 

•Question 24

3 out of 3 points

 

A examine was of-late done in which the mark self-indulgence for breakfast cereal was excited opposite the gender of the shopper. The examine consisted of 200 hardy shoppers and 300 fehardy shoppers. Three divergent cereal marks were considered: A, B, and C. A aggregate of 250 fehardy shoppers preferred mark A, 25 fehardy shoppers preferred mark C. The sum of fehardy shoppers that preferred mark B was:

.  

25.

.  

25.

100.

75.

50.

 

•Question 25

3 out of 3 points

 

How abundant ways can we appropriate three items at purposehither after a occasionout re-establishment from five items (A, B, C, D, E) if the ordain of the clarified items is not expressive?

.  

10

.60

120

 

10

24

 

•Question 26

3 out of 3 points

 

On a detail day, 112 of 280 passengers on a detail DTW-LAX departure used the e-ticket check-in kiosk to accomplish siege passes. In a purposehither pattern of prospect passengers, use the binomial pattern to perceive the border hypergeometric verisimilitude that immodest allure entertain used the e-ticket check-in kiosk to accomplish siege passes.

.  

.2322

.  

.2322

.8263

2926

.5613

 

•Question 27

3 out of 3 points

 

A main retail hoard has thoughtful customer demeanor and build that the rankification of interval customers lavish in a hoard per mark is symmetric after a occasion a mediocre correspondent to 17.3 minutes. Based on this knowledge, which of the aftercited is penny?

.  

The median is borderly 17.3 minutes.

.The rankification is bell-shaped.

The median is to the equitable of the mediocre.

 

The median is borderly 17.3 minutes.

The median is to the left of the mediocre.

 

•Question 28

3 out of 3 points

 

Assume P(A) =

0.6, P(B) = 0.7, and P(A and B) = 0.42, which mediocres that events A and B are refractory of each other.

.  True

.  True

False

 

•Question 29

3 out of 3 points

 

Suppose 10 wards are enrolled in a rank and the verisimilitude of at last 8 showing up on a dedicated day is 90 percent. Then the verisimilitude of 7 or fewer showing that day is 10 percent.

.  True

.  True

False

 

•Question 30

3 out of 3 points

 

In a late examine of the sales costs of houses in a Midwestern city, the mediocre sales cost has been mented to be $167,811 occasion the median sales cost was $155,600. From this knowledge, you can state that the facts confused in the examine are left-skewed.

.  False

.True

 False

 

•Question 31

3 out of 3 points

 

Ten percent of the corporeprove superintendents at Axolotl Industries mained in humanities. What is the expected sum of superintendents to be conferenceed until perceiveing the chief one after a occasion a humanities main?

.  

10

.15

20

 

10

17

 

•Question 32

3 out of 3 points

 

If the sum of faulty items clarified at purposehither from a compressiveness register is considered to supervene a binomial rankification after a occasion n = 50 and p =

0.10, the expected sum of faulty compressiveness is:

.  

5.

.  

5.

closely 2.24.

over than 10.

0.5.

 

•Question 33

3 out of 3 points

 

The superintendent of Ardover Pharmacy knows that 25 percent of the customers entering the hoard buy recipe drugs, 65 percent buy over-the-counter drugs, and 18 percent buy twain archetypes of drugs. What is the verisimilitude that a purposelessly clarified customer allure buy at last one of these two archetypes of drugs?

.  

0.72

.0.90

0.85

 

0.72

0.65

 

•Question 34

3 out of 3 points

 

When constructing charts, the aftercited is plotted at the rank midpoints:

.  

percentage polygons.

.abundance histograms.

 

percentage polygons.

cumulative not-absolute abundance ogives.

All of the overhead.

 

•Question 35

3 out of 3 points

 

When you bestow out a return, the verisimilitude of entity designated for an conference is .20. What is the expected sum of returns you bestow out until you get the chief conference?

.  

5

.  

5

7

10

12

 

•Question 36

3 out of 3 points

 

What archearcheemblem of verisimilitude rankification allure most slight be used to excite the sum of chocolate scrap compressiveness per cookie in the aftercited example? The nature restrain superintendent of Marilyn's Cookies is inspecting a concoct of chocolate scrap cookies. When the product arrangement is in restrain, the mediocre sum of chocolate scrap compressiveness per cookie is 6.0. The superintendent is zealous in analyzing the verisimilitude that any detail cookie entity inspected has fewer than 5.0 scrap compressiveness.

.  

Poisson rankification.

.binomial rankification.

 

Poisson rankification.

hypergeometric rankification.

none of the overhead.

 

•Question 37

3 out of 3 points

 

The employees of a association were overlooked on questions touching their educational setting and hymeneal foothold. Of the 600 employees, 400 had nursery stations, 100 were separate, and 60 were separate nursery graduates. The verisimilitude that an employee of the association does not entertain a nursery station is:

.  

0.33

.0.10

 

0.33

0.67

0.75

 

•Question 38

3 out of 3 points

 

The aftercited verisimilitude rankification has been assessed for the sum of accidents that appear in a Midwestern city each day:

 

AccidentsProbability

00.25

10.20

20.30

30.15

40.10

 

 

The verisimilitude of having hither than 2 accidents on a dedicated day is:

.  

0.45.

.0.30.

0.75.

 

0.45.

0.25.

 

•Question 39

3 out of 3 points

 

One of the characteristics of the binomial rankification is that the verisimilitude of achievement for each attempt depends on whether the preceding attempt was a achievement or not.

.  False

.True

 False

 

•Question 40

3 out of 3 points

 

Exam scores in a average rank were 10, 10, 20, 20, 40, 60, 80, 80, 90, 100, 100. For this facts set, which announcement is incorrect about measures of disposition?

.  

The geometric mediocre is 35.05

.The median is 60.00

The regulation is not helpful

The 5 percent trimmed mediocre would be awkward

 

The geometric mediocre is 35.05