Question 1

If,as a result of a hypothesis test,you reject the null hypothesis when it is false,then you have committed

Accepted Answer

A) a Type II error. 
B) a Type I error. 
C) no error. 
D) an acceptance error.

Question 2

How many tissues should the Kimberly Clark Corporation package of Kleenex contain? Researchers determined that 60 tissues is the mean number of tissues used during a cold.Suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold:  = 52, S = 22.Suppose the alternative you wanted to test was H1 : μ < 60.State the correct rejection region for α = 0.05.

Accepted Answer

A) Reject H0 if t > 1.6604. 
B) Reject H0 if t 0 if t > 1.9842 or Z 0 if t < -1.9842.

Question 3

TABLE 9-9
The president of a university claimed that the entering class this year appeared to be larger than the entering class from previous years but their mean SAT score is lower than previous years.He took a sample of 20 of this year's entering students and found that their mean SAT score is 1,501 with a standard deviation of 53.The university's record indicates that the mean SAT score for entering students from previous years is 1,520.He wants to find out if his claim is supported by the evidence at a 5% level of significance.
-True or False: Referring to Table 9-9,the evidence proves beyond a doubt that the mean SAT score of the entering class this year is lower than previous years.

Accepted Answer

A) True 
 B)False

Question 4

TABLE 9-3
An appliance manufacturer claims to have developed a compact microwave oven that consumes a mean of no more than 250 W.From previous studies,it is believed that power consumption for microwave ovens is normally distributed with a population standard deviation of 15 W.A consumer group has decided to try to discover if the claim appears true.They take a sample of 20 microwave ovens and find that they consume a mean of 257.3 W.
-Referring to Table 9-3,the population of interest is

Accepted Answer

A) the power consumption in the 20 microwave ovens. 
B) the power consumption in all such microwave ovens. 
C) the mean power consumption in the 20 microwave ovens. 
D) the mean power consumption in all such microwave ovens.

Question 5

TABLE 9-9
The president of a university claimed that the entering class this year appeared to be larger than the entering class from previous years but their mean SAT score is lower than previous years.He took a sample of 20 of this year's entering students and found that their mean SAT score is 1,501 with a standard deviation of 53.The university's record indicates that the mean SAT score for entering students from previous years is 1,520.He wants to find out if his claim is supported by the evidence at a 5% level of significance.
-True or False: Referring to Table 9-9,the null hypothesis would be rejected if a 10% probability of committing a Type I error is allowed.

Accepted Answer

A) True 
 B)False

Question 6

If an economist wishes to determine whether there is evidence that mean family income in a community equals $50,000,

Accepted Answer

A) either a one-tail or two-tail test could be used with equivalent results. 
B) a one-tail test should be utilized. 
C) a two-tail test should be utilized. 
D) None of the above.

Question 7

A major Blu-ray rental chain is considering opening a new store in an area that currently does not have any such stores.The chain will open if there is evidence that more than 5,000 of the 20,000 households in the area are equipped with Blu-ray players.It conducts a telephone poll of 300 randomly selected households in the area and finds that 96 have Blu-ray players.The decision on the hypothesis test using a 5% level of significance is

Accepted Answer

A) to reject H0 in favor of H1. 
B) to accept H0 in favor of H1. 
C) to fail to reject H0 in favor of H1. 
D) We cannot tell what the decision should be from the information given.

Question 8

TABLE 9-1
Microsoft Excel was used on a set of data involving the number of defective items found in a random sample of 46 cases of light bulbs produced during a morning shift at a plant.A manager wants to know if the mean number of defective bulbs per case is greater than 20 during the morning shift.She will make her decision using a test with a level of significance of 0.10.The following information was extracted from the Microsoft Excel output for the sample of 46 cases: 
-True or False: Referring to Table 9-1,the null hypothesis would be rejected if a 1% probability of committing a Type I error is allowed.

Accepted Answer

A) True 
 B)False

Question 9

A ________ is a numerical quantity computed from the data of a sample and is used in reaching a decision on whether or not to reject the null hypothesis.

Accepted Answer

A) significance level 
B) critical value 
C) test statistic 
D) parameter

Question 10

TABLE 9-3
An appliance manufacturer claims to have developed a compact microwave oven that consumes a mean of no more than 250 W.From previous studies,it is believed that power consumption for microwave ovens is normally distributed with a population standard deviation of 15 W.A consumer group has decided to try to discover if the claim appears true.They take a sample of 20 microwave ovens and find that they consume a mean of 257.3 W.
-True or False: Referring to Table 9-3,for this test to be valid,it is necessary that the power consumption for microwave ovens has a normal distribution.

Accepted Answer

A) True 
 B)False

Question 11

TABLE 9-8
One of the biggest issues facing e-retailers is the ability to turn browsers into buyers.This is measured by the conversion rate,the percentage of browsers who buy something in their visit to a site.The conversion rate for a company's website was 10.1%.The website at the company was redesigned in an attempt to increase its conversion rates.A sample of 200 browsers at the redesigned site was selected.Suppose that 24 browsers made a purchase.The company officials would like to know if there is evidence of an increase in conversion rate at the 5% level of significance.
-Referring to Table 9-8,state the alternative hypothesis for this study.

Accepted Answer

The answer of TABLE 9-8
One of the biggest issues facing...

Question 12

TABLE 9-7
A major home improvement store conducted its biggest brand recognition campaign in the company's history.A series of new television advertisements featuring well-known entertainers and sports figures were launched.A key metric for the success of television advertisements is the proportion of viewers who "like the ads a lot".A study of 1,189 adults who viewed the ads reported that 230 indicated that they "like the ads a lot." The percentage of a typical television advertisement receiving the "like the ads a lot" score is believed to be 22%.Company officials wanted to know if there is evidence that the series of television advertisements are less successful than the typical ad at a 0.01 level of significance.
-True or False: Referring to Table 9-7,the company officials can conclude that there is sufficient evidence to show that the series of television advertisements are less successful than the typical ad using a level of significance of 0.05.

Accepted Answer

A) True 
 B)False

Question 13

TABLE 9-9
The president of a university claimed that the entering class this year appeared to be larger than the entering class from previous years but their mean SAT score is lower than previous years.He took a sample of 20 of this year's entering students and found that their mean SAT score is 1,501 with a standard deviation of 53.The university's record indicates that the mean SAT score for entering students from previous years is 1,520.He wants to find out if his claim is supported by the evidence at a 5% level of significance.
-Referring to Table 9-9,the lowest level of significance at which the null hypothesis can still be rejected is ________.

Accepted Answer

The answer of TABLE 9-9
The president of a university claimed...

Question 14

TABLE 9-4
A drug company is considering marketing a new local anesthetic.The effective time of the anesthetic the drug company is currently producing has a normal distribution with a mean of 7.4 minutes with a standard deviation of 1.2 minutes.The chemistry of the new anesthetic is such that the effective time should be normally distributed with the same standard deviation,but the mean effective time may be lower.If it is lower,the drug company will market the new anesthetic; otherwise,they will continue to produce the older one.A sample size of 36 results in a sample mean of 7.1.A hypothesis test will be done to help make the decision.
-True or False: Referring to Table 9-4,if the level of significance had been chosen as 0.05,the null hypothesis would be rejected.

Accepted Answer

A) True 
 B)False

Question 15

TABLE 9-1
Microsoft Excel was used on a set of data involving the number of defective items found in a random sample of 46 cases of light bulbs produced during a morning shift at a plant.A manager wants to know if the mean number of defective bulbs per case is greater than 20 during the morning shift.She will make her decision using a test with a level of significance of 0.10.The following information was extracted from the Microsoft Excel output for the sample of 46 cases: 
-True or False: Referring to Table 9-1,the null hypothesis would be rejected.

Accepted Answer

A) True 
 B)False

Question 16

An entrepreneur is considering the purchase of a coin-operated laundry.The current owner claims that over the past 5 years,the mean daily revenue was $675 with a population standard deviation of $75.A sample of 30 days reveals a daily mean revenue of $625.If you were to test the null hypothesis that the daily mean revenue was $675 and decide not to reject the null hypothesis,what can you conclude?

Accepted Answer

A) There is not enough evidence to conclude that the daily mean revenue was $675. 
B) There is not enough evidence to conclude that the daily mean revenue was not $675. 
C) There is enough evidence to conclude that the daily mean revenue was $675. 
D) There is enough evidence to conclude that the daily mean revenue was not $675.

Question 17

True or False: "Is the intended sample size large enough to achieve the desired power of the test for the level of significance chosen?" should be among the questions asked when performing a hypothesis test.

Accepted Answer

A) True 
 B)False

Question 18

TABLE 9-1
Microsoft Excel was used on a set of data involving the number of defective items found in a random sample of 46 cases of light bulbs produced during a morning shift at a plant.A manager wants to know if the mean number of defective bulbs per case is greater than 20 during the morning shift.She will make her decision using a test with a level of significance of 0.10.The following information was extracted from the Microsoft Excel output for the sample of 46 cases: 
-True or False: Referring to Table 9-1,the null hypothesis would be rejected if a 5% probability of committing a Type I error is allowed.

Accepted Answer

A) True 
 B)False

Question 19

The value that separates a rejection region from a non-rejection region is called the ________.

Accepted Answer

The answer of The value that separates a rejection region...

Question 20

The marketing manager for an automobile manufacturer is interested in determining the proportion of new compact-car owners who would have purchased a knee airbag if it had been available for an additional cost of $300.The manager believes from previous information that the proportion is 0.30.Suppose that a survey of 200 new compact-car owners is selected and 79 indicate that they would have purchased the knee airbag.If you were to conduct a test to determine whether there is evidence that the proportion is different from 0.30 and decided not to reject the null hypothesis,what conclusion could you reach?

Accepted Answer

A) There is sufficient evidence that the proportion is 0.30. 
B) There is not sufficient evidence that the proportion is 0.30. 
C) There is sufficient evidence that the proportion is not 0.30. 
D) There is not sufficient evidence that the proportion is not 0.30.

Exam 9: Fundamentals of Hypothesis Testing: One-Sample Tests

If,as a result of a hypothesis test,you reject the null hypothesis when it is false,then you have committed

If an economist wishes to determine whether there is evidence that mean family income in a community equals $50,000,

A ________ is a numerical quantity computed from the data of a sample and is used in reaching a decision on whether or not to reject the null hypothesis.

True or False: "Is the intended sample size large enough to achieve the desired power of the test for the level of significance chosen?" should be among the questions asked when performing a hypothesis test.

The value that separates a rejection region from a non-rejection region is called the ________.