Stat201 midterm exam 40/40 | Mathematics homework help


•Question 1

3 out of 3 points

 

Which is a deduce for using a log layer for season course facts?

.  

It helps parallel development in season course of remote magnitude

.  

It helps parallel development in season course of remote magnitude

General duty audiences confront it easier to declare a log layer

On a log layer, similar distances indicate similar dollar amounts

The axis labels are usually easier to peruse in log units

 

•Question 2

3 out of 3 points

 

We would coadjutor the account deductive statistics delay which labor?

.  

Estimating obscure parameters

.Making visual displays of facts

 

Estimating obscure parameters

Describing a illustration of facts

Tabulating a inspect

 

•Question 3

3 out of 3 points

 

A quantity histogram should be computed from which emblem of facts?

.  

Quantitative facts

.  

Quantitative facts

Categorical facts

Nominal roll facts

Ordinal facts

 

 

•Question 4

3 out of 3 points

 

The compute of virile babies in a illustration of 10 accidentally chosen babies is a:

.  

binomial accidental fickle

.rectilineal accidental fickle

Poisson accidental fickle

binary accidental fickle

 

binomial accidental fickle

 

•Question 5

3 out of 3 points

 

A examine is subordinate way in Yosemite National Copse to detail the adult altitude of American decay trees. Specifically, the examine is attempting to detail what factors aid a tree in reaching altitudes elder than 60 feet elevated. It is estimated that the copse contains 25,000 adult American decays. The examine involves collecting altitudes from 250 accidentally separated adult American decay trees and analyzing the results. Identify the illustration in the examine.

.  

The 250 accidentally separated adult American decay trees.

.  

The 250 accidentally separated adult American decay trees.

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

All the adult American decay trees elevateder than 60 feet.

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

 

•Question 6

3 out of 3 points

 

An cannonade established rates bonds for AardCo Inc. as "B+" occasion bonds of Deva Corp. are rated "AA." Which roll of bulk would be alienate for such facts?

.  

Ordinal

.Nominal

 

Ordinal

Interval

Ratio

 

•Question 7

3 out of 3 points

 

Researchers are unquiet that the pressure of the middle American train offshoot is increasing implying, shapeclose other things, that offshootren's drapery should be contrived and marketed in bulkyr bulks. If X is the pressure of train offshootren illustrationd in a nationwide examine, then X is an illustration of

.  

a rectilineal accidental fickle.

.a plain accidental fickle.

a discrete accidental fickle.

 

a rectilineal accidental fickle.

a parameter.

 

•Question 8

3 out of 3 points

 

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

.  

standardized facts esteems.

.  

standardized facts esteems.

standardized facts layers.

standardized facts variations.

standardized facts scores.

 

•Question 9

3 out of 3 points

 

A society has 2 mediums that result widgets. An older medium results 23% wanting widgets, occasion the new medium results merely 8% wanting widgets. In conjunction, the new medium results 3 seasons as numerous widgets as the older medium does. Dedicated that a widget was resultd by the new medium, what is the appearance it is not wanting?

.  

0.92

.0.06

0.50

 

0.92

0.94

 

•Question 10

3 out of 3 points

 

Which is insignificantest slight to be treasured as a fitness fickle?

.  

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

.  

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

Automobile disburse emission of nitrogen dioxide (milligrams per mile)

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

Cost of an e-Bay lapse

 

•Question 11

3 out of 3 points

 

Based on a inspect of 400 students in a university in which 20 percent complicated that they were duty superiors. The university student newspaper relationed that "20 percent of all the students at the university are duty superiors." This relation is an illustration of

.  

statistical conclusion.

.a illustration.

a population.

 

statistical conclusion.

descriptive statistics.

 

•Question 12

3 out of 3 points

 

"Bob must be luscious. He's a counsel, and counsels bring-about lots of specie." This proposition best illustrates which misconception?

.  

Generalizing from an middle to an individual

.Using thin inspect methods

Confusing import delay importance

Unconscious bias

 

Generalizing from an middle to an individual

 

•Question 13

3 out of 3 points

 

In a unfailing city, 5 percent of all drivers feel expired permits, 10 percent feel an unpaid parking ticket, and 1 percent feel twain an expired permit and an unpaid parking ticket. Are these events refractory?

.  

No

.  

No

Yes

Can’t discriminate from dedicated knowledge

 

•Question 14

3 out of 3 points

 

Retailers are faithfully zealous in determining why a customer separated their fund to bring-about a lapse. A sporting pi retailer conducted a customer inspect to detail why its customers shopped at the fund. The results are shown in the bar chart adown. What correlation of the customers responded that they shopped at the fund owing of the goods or the ease?

 

.  

65%

.35%

50%

 

65%

85%

 

•Question 15

3 out of 3 points

 

Which of the forthcoming is penny delay regard to the binomial division?

.  

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

.As the illustration bulk increases, the expected esteem of the accidental fickle decreases.

The binomial division becomes further skewed as the illustration bulk is increased for a dedicated appearance of consummation.

 

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

In collocateify for the binomial division to be skewed, the illustration bulk must be perfectly bulky.

 

•Question 16

3 out of 3 points

 

Based on the experimental administration we can claim that all divisions feel trenchly 95 percent of the esteems delayin ± 2 test intermissions of the statuteration.

.  True

.  True

False

 

•Question 17

3 out of 3 points

 

The accidental fickle X

is the compute of shots it takes anteriorly you bring-about the highest generous hurl in basketball. Assuming the appearance of consummation (making a generous hurl) is faithful from suffering to suffering, what emblem of division does X

follow?

.  

Geometric

.Binomial

Poisson

Hypergeometric

 

Geometric

 

•Question 18

3 out of 3 points

 

Which is not considered a deceptive graphical technique?

.  

Axis demarcations

.Nonzero origin

Elastic graph correlations

Dramatic title

 

Axis demarcations

 

•Question 19

3 out of 3 points

 

We would use a pivot consideration to:

.  

cross-tabulate frequencies of transaction of two fickles

.  

cross-tabulate frequencies of transaction of two fickles

rotate the facts environing a mediate 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 esteem of a discrete accidental fickle E(X) is the sum of all X esteems pressureed 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. Confront 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 interior accidentally and refractoryly at a rate of 5 per hour on middle, what is the appearance that precisely 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 accidental fickle is binomially exclusive delay n = 16 and pi = .40. The expected esteem and test intermission of the fickles 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 new-fangledly done in which the mark satisfaction for breakfast cereal was irritated opposing the gender of the shopper. The examine consisted of 200 virile shoppers and 300 fevirile shoppers. Three divergent cereal marks were considered: A, B, and C. A completion of 250 fevirile shoppers preferred mark A, 25 fevirile shoppers preferred mark C. The compute of fevirile shoppers that preferred mark B was:

.  

25.

.  

25.

100.

75.

50.

 

•Question 25

3 out of 3 points

 

How numerous ways can we elect three items at accidental delayout regaining from five items (A, B, C, D, E) if the collocateify of the separated items is not main?

.  

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 exodus used the e-ticket check-in kiosk to allure siege passes. In a accidental illustration of prospect passengers, use the binomial example to confront the trench hypergeometric appearance that lewd allure feel used the e-ticket check-in kiosk to allure siege passes.

.  

.2322

.  

.2322

.8263

2926

.5613

 

•Question 27

3 out of 3 points

 

A superior retail fund has learned customer demeanor and fix that the division of season customers disburse in a fund per investigate is symmetric delay a statuteration similar to 17.3 minutes. Based on this knowledge, which of the forthcoming is penny?

.  

The median is trenchly 17.3 minutes.

.The division is bell-shaped.

The median is to the straight of the statuteration.

 

The median is trenchly 17.3 minutes.

The median is to the left of the statuteration.

 

•Question 28

3 out of 3 points

 

Assume P(A) =

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

.  True

.  True

False

 

•Question 29

3 out of 3 points

 

Suppose 10 students are enrolled in a collocate and the appearance of at insignificantest 8 showing up on a dedicated 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 examine of the sales charges of houses in a Midwestern city, the statuteration sales charge has been relationed to be $167,811 occasion the median sales charge was $155,600. From this knowledge, you can detail that the facts complicated in the examine are left-skewed.

.  False

.True

 False

 

•Question 31

3 out of 3 points

 

Ten percent of the municipal directors at Axolotl Industries superiored in humanities. What is the expected compute of directors to be conferenceed until confronting the highest one delay a humanities superior?

.  

10

.15

20

 

10

17

 

•Question 32

3 out of 3 points

 

If the compute of wanting items separated at accidental from a compatability list is considered to flourish a binomial division delay n = 50 and p =

0.10, the expected compute of wanting compatability is:

.  

5.

.  

5.

almost 2.24.

further than 10.

0.5.

 

•Question 33

3 out of 3 points

 

The director of Ardfurther Pharmacy knows that 25 percent of the customers entering the fund buy direction drugs, 65 percent buy over-the-counter drugs, and 18 percent buy twain emblems of drugs. What is the appearance that a accidentally separated customer allure buy at insignificantest one of these two emblems 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 collocate midpoints:

.  

percentage polygons.

.quantity histograms.

 

percentage polygons.

cumulative not-absolute quantity ogives.

All of the overhead.

 

•Question 35

3 out of 3 points

 

When you grant out a return, the appearance of substance designated for an conference is .20. What is the expected compute of returns you grant out until you get the highest conference?

.  

5

.  

5

7

10

12

 

•Question 36

3 out of 3 points

 

What emblem of appearance division allure most slight be used to irritate the compute of chocolate remnant compatability per cookie in the forthcoming problem? The virtue govern director of Marilyn's Cookies is inspecting a frame of chocolate remnant cookies. When the origination order is in govern, the middle compute of chocolate remnant compatability per cookie is 6.0. The director is zealous in analyzing the appearance that any point cookie substance inspected has fewer than 5.0 remnant compatability.

.  

Poisson division.

.binomial division.

 

Poisson division.

hypergeometric division.

none of the overhead.

 

•Question 37

3 out of 3 points

 

The employees of a society were inspected on questions touching their educational setting and conjugal foothold. Of the 600 employees, 400 had seed-plot orders, 100 were unmarried, and 60 were unmarried seed-plot graduates. The appearance that an employee of the society does not feel a seed-plot order 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 compute of accidents that supervene 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 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 division is that the appearance of consummation for each suffering depends on whether the prior suffering was a consummation or not.

.  False

.True

 False

 

•Question 40

3 out of 3 points

 

Exam scores in a insignificant collocate were 10, 10, 20, 20, 40, 60, 80, 80, 90, 100, 100. For this facts set, which proposition is incorrect relating measures of interior?

.  

The geometric statuteration is 35.05

.The median is 60.00

The statute is not helpful

The 5 percent trimmed statuteration would be awkward

 

The geometric statuteration is 35.05