Stat201 midterm exam 40/40 | Mathematics homework help


•Question 1

3 out of 3 points

 

Which is a infer for using a log layer for age rotation postulates?

.  

It helps parallel augmentation in age rotation of inferior magnitude

.  

It helps parallel augmentation in age rotation of inferior magnitude

General trade audiences invent it easier to render a log layer

On a log layer, similar distances personate similar dollar amounts

The axis labels are usually easier to learn in log units

 

•Question 2

3 out of 3 points

 

We would coadjutor the tidings hearsay statistics delay which labor?

.  

Estimating mysterious parameters

.Making visual displays of postulates

 

Estimating mysterious parameters

Describing a scantling of postulates

Tabulating a view

 

•Question 3

3 out of 3 points

 

A abundance histogram should be computed from which sign of postulates?

.  

Quantitative postulates

.  

Quantitative postulates

Categorical postulates

Nominal raze postulates

Ordinal postulates

 

 

•Question 4

3 out of 3 points

 

The enumescold of virile babies in a scantling of 10 aimlessly separated babies is a:

.  

binomial aimnear shifting

.rectilineal aimnear shifting

Poisson aimnear shifting

binary aimnear shifting

 

binomial aimnear shifting

 

•Question 5

3 out of 3 points

 

A con-over is inferior way in Yosemite National Forest to detail the adult loftyness of American sink trees. Specifically, the con-over is attempting to detail what factors aid a tree in reaching loftynesss influential than 60 feet lofty. It is estimated that the forest contains 25,000 adult American sinks. The con-over involves collecting loftynesss from 250 aimlessly chosen adult American sink trees and analyzing the results. Identify the scantling in the con-over.

.  

The 250 aimlessly chosen adult American sink trees.

.  

The 250 aimlessly chosen adult American sink trees.

The 25,000 adult American sink trees in the forest.

All the adult American sink trees loftyer than 60 feet.

All American sink trees, of any age, in the forest.

 

•Question 6

3 out of 3 points

 

An cannonade robust scolds bonds for AardCo Inc. as "B+" conjuncture bonds of Deva Corp. are scoldd "AA." Which raze of extent would be embezzle for such postulates?

.  

Ordinal

.Nominal

 

Ordinal

Interval

Ratio

 

•Question 7

3 out of 3 points

 

Researchers are solicitous that the burden of the mediocre American develop child is increasing implying, incompact other things, that conclusion's drapery should be simulated and marketed in enlightenedr bulks. If X is the burden of develop conclusion scantlingd in a nationwide con-over, then X is an in of

.  

a rectilineal aimnear shifting.

.a declaratory aimnear shifting.

a discrete aimnear shifting.

 

a rectilineal aimnear shifting.

a parameter.

 

•Question 8

3 out of 3 points

 

When comparing postulates measured by really irreferring-to layers, we must use

.  

standardized postulates esteems.

.  

standardized postulates esteems.

standardized postulates layers.

standardized postulates variations.

standardized postulates scores.

 

•Question 9

3 out of 3 points

 

A troop has 2 implements that profit widgets. An older implement profits 23% imperfect widgets, conjuncture the new implement profits merely 8% imperfect widgets. In conjunction, the new implement profits 3 ages as abundant widgets as the older implement does. Loving that a widget was profitd by the new implement, what is the likelihood it is not imperfect?

.  

0.92

.0.06

0.50

 

0.92

0.94

 

•Question 10

3 out of 3 points

 

Which is balanceest slight to be present as a agreement shifting?

.  

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 empty oration of nitrogen dioxide (milligrams per mile)

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

Cost of an e-Bay acquisition

 

•Question 11

3 out of 3 points

 

Based on a view of 400 wards in a university in which 20 percent indicated that they were trade greaters. The university ward newspaper declarationed that "20 percent of all the wards at the university are trade greaters." This declaration is an in of

.  

statistical deduction.

.a scantling.

a population.

 

statistical deduction.

descriptive statistics.

 

•Question 12

3 out of 3 points

 

"Bob must be oleaginous. He's a attorney, and attorneys fabricate lots of specie." This announcement best illustrates which chimera?

.  

Generalizing from an mediocre to an individual

.Using unsatisfactory view methods

Confusing view delay importance

Unconscious bias

 

Generalizing from an mediocre to an individual

 

•Question 13

3 out of 3 points

 

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

.  

No

.  

No

Yes

Can’t mention from loving notification

 

•Question 14

3 out of 3 points

 

Retailers are frequently spirited in determining why a customer chosen their ammunition to fabricate a acquisition. A sporting result retailer conducted a customer view to detail why its customers shopped at the ammunition. The results are shown in the bar chart adown. What division of the customers responded that they shopped at the ammunition accordingly of the stock or the ease?

 

.  

65%

.35%

50%

 

65%

85%

 

•Question 15

3 out of 3 points

 

Which of the aftercited is gentleman delay honor to the binomial division?

.  

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

.As the scantling bulk increases, the expected esteem of the aimnear shifting decreases.

The binomial division becomes over skewed as the scantling bulk is increased for a loving likelihood of luck.

 

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

In regulate for the binomial division to be skewed, the scantling bulk must be altogether enlightened.

 

•Question 16

3 out of 3 points

 

Based on the tentative administration we can postulate that all divisions accept abutly 95 percent of the esteems delayin ± 2 exemplar flexions of the balance.

.  True

.  True

False

 

•Question 17

3 out of 3 points

 

The aimnear shifting X

is the enumescold of shots it takes anteriorly you fabricate the highest easy project in basketball. Assuming the likelihood of luck (making a easy project) is immuconsultation from affliction to affliction, what sign of division does X

follow?

.  

Geometric

.Binomial

Poisson

Hypergeometric

 

Geometric

 

•Question 18

3 out of 3 points

 

Which is not considered a fabrication graphical technique?

.  

Axis demarcations

.Nonzero origin

Elastic graph divisions

Dramatic title

 

Axis demarcations

 

•Question 19

3 out of 3 points

 

We would use a pivot consultation to:

.  

cross-tabulate frequencies of affair of two shiftings

.  

cross-tabulate frequencies of affair of two shiftings

rotate the postulates environing a convenient point

establish cause-and-effect among X and Y

display the postulates in a 3D strew plot

 

•Question 20

3 out of 3 points

 

The expected esteem of a discrete aimnear shifting E(X) is the sum of all X esteems burdened by their honorive 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 imperil $1. Invent 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 employment nucleus aimlessly and rebelliously at a scold of 5 per hour on mediocre, what is the likelihood that precisely 5 cars gain get during a loving hour?

.  

0.1755

.  

0.1755

0.6160

0.1277

Essentially zero

 

•Question 23

3 out of 3 points

 

A aimnear shifting is binomially exclusive delay n = 16 and pi = .40. The expected esteem and exemplar flexion of the shiftings 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 con-over was freshly effected in which the infamy purpose for breakfast cereal was irritated over the gender of the shopper. The con-over consisted of 200 virile shoppers and 300 fevirile shoppers. Three irreferring-to cereal infamys were considered: A, B, and C. A entirety of 250 fevirile shoppers preferred infamy A, 25 fevirile shoppers preferred infamy C. The enumescold of fevirile shoppers that preferred infamy B was:

.  

25.

.  

25.

100.

75.

50.

 

•Question 25

3 out of 3 points

 

How abundant ways can we pick-out three items at aimnear delayout restitution from five items (A, B, C, D, E) if the regulate of the chosen items is not influential?

.  

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 stampede used the e-ticket check-in kiosk to get investment passes. In a aimnear scantling of prospect passengers, use the binomial pattern to invent the abut hypergeometric likelihood that four gain accept used the e-ticket check-in kiosk to get investment passes.

.  

.2322

.  

.2322

.8263

2926

.5613

 

•Question 27

3 out of 3 points

 

A greater retail ammunition has elaborate customer deportment and institute that the division of age customers disburse in a ammunition per scrutinize is symmetric delay a balance similar to 17.3 minutes. Based on this notification, which of the aftercited is gentleman?

.  

The median is abutly 17.3 minutes.

.The division is bell-shaped.

The median is to the fair of the balance.

 

The median is abutly 17.3 minutes.

The median is to the left of the balance.

 

•Question 28

3 out of 3 points

 

Assume P(A) =

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

.  True

.  True

False

 

•Question 29

3 out of 3 points

 

Suppose 10 wards are enrolled in a adjust and the likelihood of at balanceest 8 showing up on a loving day is 90 percent. Then the likelihood of 7 or fewer showing that day is 10 percent.

.  True

.  True

False

 

•Question 30

3 out of 3 points

 

In a fresh con-over of the sales costs of houses in a Midwestern city, the balance sales cost has been declarationed to be $167,811 conjuncture the median sales cost was $155,600. From this notification, you can detail that the postulates complicated in the con-over are left-skewed.

.  False

.True

 False

 

•Question 31

3 out of 3 points

 

Ten percent of the corposcold overseers at Axolotl Industries greatered in humanities. What is the expected enumescold of overseers to be conferenceed until inventing the highest one delay a humanities greater?

.  

10

.15

20

 

10

17

 

•Question 32

3 out of 3 points

 

If the enumescold of imperfect items chosen at aimnear from a talents list is considered to supervene a binomial division delay n = 50 and p =

0.10, the expected enumescold of imperfect talents is:

.  

5.

.  

5.

approximately 2.24.

over than 10.

0.5.

 

•Question 33

3 out of 3 points

 

The overseer of Ardover Pharmacy knows that 25 percent of the customers entering the ammunition buy recipe drugs, 65 percent buy over-the-counter drugs, and 18 percent buy twain signs of drugs. What is the likelihood that a aimlessly chosen customer gain buy at balanceest one of these two signs 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 adjust midpoints:

.  

percentage polygons.

.abundance histograms.

 

percentage polygons.

cumulative referring-to abundance ogives.

All of the overhead.

 

•Question 35

3 out of 3 points

 

When you despatch out a return, the likelihood of life designated for an conference is .20. What is the expected enumescold of returns you despatch out until you get the highest conference?

.  

5

.  

5

7

10

12

 

•Question 36

3 out of 3 points

 

What sign of likelihood division gain most slight be used to irritate the enumescold of chocolate driblet talents per cookie in the aftercited height? The condition manage overseer of Marilyn's Cookies is inspecting a batch of chocolate driblet cookies. When the evolution course is in manage, the mediocre enumescold of chocolate driblet talents per cookie is 6.0. The overseer is spirited in analyzing the likelihood that any detail cookie life inspected has fewer than 5.0 driblet talents.

.  

Poisson division.

.binomial division.

 

Poisson division.

hypergeometric division.

none of the overhead.

 

•Question 37

3 out of 3 points

 

The employees of a troop were viewed on questions regarding their educational elucidation and connubial foothold. Of the 600 employees, 400 had nursery ranges, 100 were uncompounded, and 60 were uncompounded nursery graduates. The likelihood that an employee of the troop does not accept a nursery range is:

.  

0.33

.0.10

 

0.33

0.67

0.75

 

•Question 38

3 out of 3 points

 

The aftercited likelihood division has been assessed for the enumescold of accidents that appear in a Midwestern city each day:

 

AccidentsProbability

00.25

10.20

20.30

30.15

40.10

 

 

The likelihood of having near than 2 accidents on a loving 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 likelihood of luck for each affliction depends on whether the foregoing affliction was a luck or not.

.  False

.True

 False

 

•Question 40

3 out of 3 points

 

Exam scores in a trivial adjust were 10, 10, 20, 20, 40, 60, 80, 80, 90, 100, 100. For this postulates set, which announcement is incorrect regarding measures of nucleus?

.  

The geometric balance is 35.05

.The median is 60.00

The rule is not helpful

The 5 percent trimmed balance would be awkward

 

The geometric balance is 35.05