1)

Exhibit 9-31

n=64

H₀:=60,

X bar=64.8

H_a:60

=24

Refer to Exhibit 9-31. Thep-value is equal to _____.

Question 1 options:

.2698

.0548

.2302

.1096

Question 2

In stats we can either use a critical value or ap-value approach for hypothesis testing. If thep-value approach our decision rule is to reject the null hypothesis if_____.

Question 2 options:

p-value>

p-value=z

p-value is 1

p-value

Question 3

A sample of 80 observations will be taken from a process (an infinite population). The population proportion equals .16. The probability that the sample proportion will be less than .1768 is _____.

Question 3 options:

.9222

.0778

.3409

.6591

Question 4

A population has a mean of 180 and a standard deviation of 36. A sample of 81 observations will be taken. The probability that the mean from that sample will be between 182 and 178 is _____.

Question 4 options:

0.1359

0.3829

0.8185

0.0228

Question 5

Exhibit 8-12

In order to estimate the average time spent on an exam at a local university, data were collected from a sample of 36 business students over a one-week period. Assume the population standard deviation is 6 hours.

Refer to Exhibit 8-12. With a .95 probability, the margin of error is approximately_____.

Question 5 options:

1.96

1.64

.26

.21

Question 6

If we want to provide a 95% confidence interval for the mean of a population, the Z value is:

1.645

1.96

.485

.95

Question 9

Exhibit 9-61

A random sample of 64 people was taken. Forty percent of the people in the sample favored Candidate H. We are interested in determining whether or not the proportion of the population in favor of Candidate H is significantly more than 50%.

Refer to Exhibit 9-61. The test statistic is_____.

1.6

-2.80

1.25

-1.6

Question 10

If the population involves an ongoing process that makes listing or counting every element in the population impossible, we consider N to be ____.

infinite

skewed

finite

known

Question 11(1 point)

Exhibit 8-31

A random sample of 36 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 12 mph.

Refer to Exhibit 8-31. The 90% confidence interval foris _____.

Question 11 options:

60 to 70

58.148 to 60.852

56.71 to 63.29

57.735 to 62.265

Question 12

Thetdistribution should be used whenever_____.

Question 12 options:

the sample size is less than 30

the population is not normally distributed

None of the answers is correct.

the population standard deviation is unknown

A population has a mean of 52 and a standard deviation of 22. A sample of 121 observations will be taken. The probability that the sample mean will be greater than 54 is _____.

Question 13 options:

.0495

.1587

.4505

0

Question 14

Exhibit 8-12

In order to estimate the average time spent on an exam at a local university, data were collected from a sample of 36 business students over a one-week period. Assume the population standard deviation is 6 hours.

Refer to Exhibit 8-12.The value to use for the standard error of the mean is _____.

1

1.5

2.26

13.5

Question 15(1 point)

Exhibit 9-31

n=64, H₀:=60, X bar=64.8, H_a:60, =24

Refer to Exhibit 9-31. The test statistic equals _____.

-1.2

.396

1.2

1.6

Question 16

The number of random samples (without replacement) of size 3 that can be drawn from a population of size 7 is _____.

0

14

35

21

Question 17

For point estimators, such as xbar and pbar, the standard deviation is also called the _____.

Question 17 options:

sampling error

standard error

point estimate

sample statistic

Question 18

Exhibit 8-31

A random sample of 36 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 12 mph.

Refer to Exhibit 8-31.If the sample size was 49 (other factors remain unchanged), the interval forwould_____.

not change

become narrower

become zero

become wider

Question 19

If we change a 95% confidence interval estimate to a 90% confidence interval estimate, we can expect the_____.

Question 19 options:

width of the confidence interval to remain the same

sample size to increase

width of the confidence interval to decrease

width of the confidence interval to increase

Question 21

If the hypotheses areH₀:=60 H_a:60, we need anhypothesis test in_____.

Question 21 options:

in both tails of the sampling distribution

in one tail of the sampling distribution

only in the lower tail of the sampling distribution

only in the upper tail of the sampling distribution

Excel Problem

Question 20

A meteorologist stated that the average temperature during April in Atlanta was 75 degrees.A sample of April temperatures over a 42-year period was taken to test whether average temperatures have beenincreasing.The correct set of hypotheses is_____.

Question 20 options:

H₀:<75H_a:75

H₀:75H_a:> 75

H₀:75 H_a:=75

H₀:=75 H_a:75