Stat201 midterm exam 40/40 | Mathematics homework help


•Question 1

3 out of 3 points

 

Which is a argue for using a log lamina for occasion command axioms?

.  

It helps assimilate development in occasion command of inferior magnitude

.  

It helps assimilate development in occasion command of inferior magnitude

General office audiences experience it easier to expone a log lamina

On a log lamina, correspondent distances indicate correspondent dollar amounts

The axis labels are usually easier to interpret in log units

 

•Question 2

3 out of 3 points

 

We would ally the engagement deductive statistics after a durationliness which operation?

.  

Estimating obscure parameters

.Making visual displays of axioms

 

Estimating obscure parameters

Describing a specimen of axioms

Tabulating a examine

 

•Question 3

3 out of 3 points

 

A abundance histogram should be computed from which expression of axioms?

.  

Quantitative axioms

.  

Quantitative axioms

Categorical axioms

Nominal resemblingize axioms

Ordinal axioms

 

 

•Question 4

3 out of 3 points

 

The reckon of virile babies in a specimen of 10 casually separated babies is a:

.  

binomial casual wavering

.faithful casual wavering

Poisson casual wavering

binary casual wavering

 

binomial casual wavering

 

•Question 5

3 out of 3 points

 

A consider is lower way in Yosemite National Copse to designate the adult exaltation of American delayer trees. Specifically, the consider is attempting to designate what factors aid a tree in reaching exaltations greater than 60 feet high. It is estimated that the copse contains 25,000 adult American delayers. The consider involves collecting exaltations from 250 casually separated adult American delayer trees and analyzing the results. Identify the specimen in the consider.

.  

The 250 casually separated adult American delayer trees.

.  

The 250 casually separated adult American delayer trees.

The 25,000 adult American delayer trees in the copse.

All the adult American delayer trees higher than 60 feet.

All American delayer trees, of any age, in the copse.

 

•Question 6

3 out of 3 points

 

An bombardment decided reprimands bonds for AardCo Inc. as "B+" durationliness bonds of Deva Corp. are reprimandd "AA." Which resemblingize of bulk would be alienate for such axioms?

.  

Ordinal

.Nominal

 

Ordinal

Interval

Ratio

 

•Question 7

3 out of 3 points

 

Researchers are careful that the impressiveness of the medium American school cadet is increasing implying, incomplete other things, that cadetren's investment should be fictitious and marketed in bigr magnitudes. If X is the impressiveness of school cadetren specimend in a nationwide consider, then X is an in of

.  

a faithful casual wavering.

.a declaratory casual wavering.

a discrete casual wavering.

 

a faithful casual wavering.

a parameter.

 

•Question 8

3 out of 3 points

 

When comparing axioms measured by actually unanalogous laminas, we must use

.  

standardized axioms esteems.

.  

standardized axioms esteems.

standardized axioms laminas.

standardized axioms variations.

standardized axioms scores.

 

•Question 9

3 out of 3 points

 

A crew has 2 implements that profit widgets. An older implement profits 23% insufficient widgets, durationliness the new implement profits singly 8% insufficient widgets. In restitution, the new implement profits 3 occasions as manifold widgets as the older implement does. Ardent that a widget was profitd by the new implement, what is the appearance it is not insufficient?

.  

0.92

.0.06

0.50

 

0.92

0.94

 

•Question 10

3 out of 3 points

 

Which is mediumest slight to be cherished as a connection wavering?

.  

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

.  

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

Automobile waste speech of nitrogen dioxide (milligrams per mile)

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

Cost of an e-Bay forfeiture

 

•Question 11

3 out of 3 points

 

Based on a examine of 400 novices in a university in which 20 percent indicated that they were office elders. The university novice newspaper announceed that "20 percent of all the novices at the university are office elders." This announce is an in of

.  

statistical deduction.

.a specimen.

a population.

 

statistical deduction.

descriptive statistics.

 

•Question 12

3 out of 3 points

 

"Bob must be bright. He's a attorney, and attorneys establish lots of specie." This assertion best illustrates which fiction?

.  

Generalizing from an medium to an individual

.Using indigent examine methods

Confusing opinion after a durationliness importance

Unconscious bias

 

Generalizing from an medium to an individual

 

•Question 13

3 out of 3 points

 

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

.  

No

.  

No

Yes

Can’t divulge from ardent advice

 

•Question 14

3 out of 3 points

 

Retailers are regularly assiduous in determining why a customer separated their place-of-business to establish a forfeiture. A sporting commodities vender conducted a customer examine to designate why its customers shopped at the place-of-business. The results are shown in the bar chart underneath. What adaptation of the customers responded that they shopped at the place-of-business accordingly of the wares or the convenience?

 

.  

65%

.35%

50%

 

65%

85%

 

•Question 15

3 out of 3 points

 

Which of the forthcoming is gentleman after a durationliness i-elation to the binomial division?

.  

The binomial division tends to be past symmetric as p approaches 0.5.

.As the specimen magnitude increases, the expected esteem of the casual wavering decreases.

The binomial division becomes past skewed as the specimen magnitude is increased for a ardent appearance of good-fortune.

 

The binomial division tends to be past symmetric as p approaches 0.5.

In command for the binomial division to be skewed, the specimen magnitude must be wholly big.

 

•Question 16

3 out of 3 points

 

Based on the tentative government we can affect that all divisions keep almost 95 percent of the esteems after a durationlinessin ± 2 measure flexions of the medium.

.  True

.  True

False

 

•Question 17

3 out of 3 points

 

The casual wavering X

is the reckon of shots it takes precedently you establish the foremost operating cast in basketball. Assuming the appearance of good-fortune (making a operating cast) is inunsteady from tribulation to tribulation, what expression of division does X

follow?

.  

Geometric

.Binomial

Poisson

Hypergeometric

 

Geometric

 

•Question 18

3 out of 3 points

 

Which is not considered a falsity graphical technique?

.  

Axis demarcations

.Nonzero origin

Elastic graph adaptations

Dramatic title

 

Axis demarcations

 

•Question 19

3 out of 3 points

 

We would use a pivot table to:

.  

cross-tabulate frequencies of affair of two waverings

.  

cross-tabulate frequencies of affair of two waverings

rotate the axioms about a mediate point

establish cause-and-effect between X and Y

display the axioms in a 3D disseminate plot

 

•Question 20

3 out of 3 points

 

The expected esteem of a discrete casual wavering E(X) is the sum of all X esteems impressivenessed by their i-elationive 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 surrender $1. Experience the expected winnings.

.  

$0.50

.  

$0.50

$3.00

$1.50

$1.00

 

•Question 22

3 out of 3 points

 

If cars get to a utility courage casually and defiantly at a reprimand of 5 per hour on medium, what is the appearance that accurately 5 cars allure get during a ardent hour?

.  

0.1755

.  

0.1755

0.6160

0.1277

Essentially zero

 

•Question 23

3 out of 3 points

 

A casual wavering is binomially arranged after a durationliness n = 16 and pi = .40. The expected esteem and measure flexion of the waverings 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 consider was new-fangledly effected in which the mark vill for breakfast cereal was dissectd opposite the gender of the shopper. The consider consisted of 200 virile shoppers and 300 fevirile shoppers. Three unanalogous cereal marks were considered: A, B, and C. A entirety of 250 fevirile shoppers preferred mark A, 25 fevirile shoppers preferred mark C. The reckon of fevirile shoppers that preferred mark B was:

.  

25.

.  

25.

100.

75.

50.

 

•Question 25

3 out of 3 points

 

How manifold ways can we pick-out three items at casual after a durationlinessout regaining from five items (A, B, C, D, E) if the command of the separated items is not dignified?

.  

10

.60

120

 

10

24

 

•Question 26

3 out of 3 points

 

On a point day, 112 of 280 passengers on a point DTW-LAX stampede used the e-ticket check-in kiosk to get siege passes. In a casual specimen of prospect passengers, use the binomial sign to experience the trench hypergeometric appearance that disgusting allure keep used the e-ticket check-in kiosk to get siege passes.

.  

.2322

.  

.2322

.8263

2926

.5613

 

•Question 27

3 out of 3 points

 

A elder vend place-of-business has thought-out customer manner and endow that the division of occasion customers exhaust in a place-of-business per investigate is symmetric after a durationliness a medium correspondent to 17.3 minutes. Based on this advice, which of the forthcoming is gentleman?

.  

The median is almost 17.3 minutes.

.The division is bell-shaped.

The median is to the suitable of the medium.

 

The median is almost 17.3 minutes.

The median is to the left of the medium.

 

•Question 28

3 out of 3 points

 

Assume P(A) =

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

.  True

.  True

False

 

•Question 29

3 out of 3 points

 

Suppose 10 novices are enrolled in a dispose and the appearance of at mediumest 8 showing up on a ardent day is 90 percent. Then the appearance of 7 or fewer showing that day is 10 percent.

.  True

.  True

False

 

•Question 30

3 out of 3 points

 

In a new-fangled consider of the sales figures of houses in a Midwestern city, the medium sales figure has been announceed to be $167,811 durationliness the median sales figure was $155,600. From this advice, you can designate that the axioms compromised in the consider are left-skewed.

.  False

.True

 False

 

•Question 31

3 out of 3 points

 

Ten percent of the corporeprimand superintendents at Axolotl Industries eldered in humanities. What is the expected reckon of superintendents to be confabulationed until experienceing the foremost one after a durationliness a humanities elder?

.  

10

.15

20

 

10

17

 

•Question 32

3 out of 3 points

 

If the reckon of insufficient items separated at casual from a volume list is considered to flourish a binomial division after a durationliness n = 50 and p =

0.10, the expected reckon of insufficient volume is:

.  

5.

.  

5.

almost 2.24.

past than 10.

0.5.

 

•Question 33

3 out of 3 points

 

The superintendent of Ardpast Pharmacy knows that 25 percent of the customers entering the place-of-business buy usage drugs, 65 percent buy over-the-counter drugs, and 18 percent buy twain expressions of drugs. What is the appearance that a casually separated customer allure buy at mediumest one of these two expressions of drugs?

.  

0.72

.0.90

0.85

 

0.72

0.65

 

•Question 34

3 out of 3 points

 

When constructing charts, the forthcoming is plotted at the dispose midpoints:

.  

percentage polygons.

.abundance histograms.

 

percentage polygons.

cumulative referring-to abundance ogives.

All of the over.

 

•Question 35

3 out of 3 points

 

When you bestow out a return, the appearance of nature designated for an confabulation is .20. What is the expected reckon of returns you bestow out until you get the foremost confabulation?

.  

5

.  

5

7

10

12

 

•Question 36

3 out of 3 points

 

What expression of appearance division allure most slight be used to dissect the reckon of chocolate piece volume per cookie in the forthcoming height? The tendency repress superintendent of Marilyn's Cookies is inspecting a frame of chocolate piece cookies. When the genesis way is in repress, the medium reckon of chocolate piece volume per cookie is 6.0. The superintendent is assiduous in analyzing the appearance that any point cookie nature inspected has fewer than 5.0 piece volume.

.  

Poisson division.

.binomial division.

 

Poisson division.

hypergeometric division.

none of the over.

 

•Question 37

3 out of 3 points

 

The employees of a crew were examineed on questions touching their educational enhancement and conjugal status. Of the 600 employees, 400 had garden grades, 100 were unique, and 60 were unique garden graduates. The appearance that an employee of the crew does not keep a garden grade is:

.  

0.33

.0.10

 

0.33

0.67

0.75

 

•Question 38

3 out of 3 points

 

The forthcoming appearance division has been assessed for the reckon of accidents that happen in a Midwestern city each day:

 

AccidentsProbability

00.25

10.20

20.30

30.15

40.10

 

 

The appearance of having close than 2 accidents on a ardent 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 division is that the appearance of good-fortune for each tribulation depends on whether the earlier tribulation was a good-fortune or not.

.  False

.True

 False

 

•Question 40

3 out of 3 points

 

Exam scores in a slight dispose were 10, 10, 20, 20, 40, 60, 80, 80, 90, 100, 100. For this axioms set, which assertion is faulty touching measures of courage?

.  

The geometric medium is 35.05

.The median is 60.00

The mode is not helpful

The 5 percent trimmed medium would be awkward

 

The geometric medium is 35.05