Question 1

A Type II error is committed when

Accepted Answer

A) you reject a null hypothesis that is true. 
B) you don't reject a null hypothesis that is true. 
C) you reject a null hypothesis that is ESQ. 
D) you don't reject a null hypothesis that is ESQ. 
A) you reject a null hypothesis that is true. 
B) you don't reject a null hypothesis that is true. 
C) you reject a null hypothesis that is ESQ. 
D) you don't reject a null hypothesis that is ESQ.

Question 2

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 was 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 (i.e.if there is evidence that the population proportion of "like the ads a lot" for the company's ads is less than 0.22)at a 0.01 level of significance.
-Referring to Table 9-7,the largest level of significance at which the null hypothesis will not be rejected is ________.

Accepted Answer

0.0135 or

Question 3

A survey claims that 9 out of 10 doctors recommend aspirin for their patients with headaches.To test this claim against the alternative that the actual proportion of doctors who recommend aspirin is less than 0.90,a random sample of 100 doctors was selected.Suppose that the test statistic is -2.20.Can you conclude that H₀ should be rejected at the (a)α = 0.10,?(b)α = 0.05,and (c)α = 0.01 level of Type I error?

Accepted Answer

A) (a)yes; (b)yes; (c)yes 
B) (a)no; (b)no; (c)no 
C) (a)no; (b)no; (c)yes 
D) (a)yes; (b)yes; (c)no 
A) (a)yes; (b)yes; (c)yes 
B) (a)no; (b)no; (c)no 
C) (a)no; (b)no; (c)yes 
D) (a)yes; (b)yes; (c)no

Question 4

In conducting research,you should document both good and bad results.

Accepted Answer

A) True 
 B)False

Question 5

If a test of hypothesis has a Type I error probability (α)of 0.01,it means that

Accepted Answer

A) if the null hypothesis is true,you don't reject it 1% of the time. 
B) if the null hypothesis is true,you reject it 1% of the time. 
C) if the null hypothesis is ESQ,you don't reject it 1% of the time. 
D) if the null hypothesis is ESQ,you reject it 1% of the time. 
A) if the null hypothesis is true,you don't reject it 1% of the time. 
B) if the null hypothesis is true,you reject it 1% of the time. 
C) if the null hypothesis is ESQ,you don't reject it 1% of the time. 
D) if the null hypothesis is ESQ,you reject it 1% of the time.

Question 6

In a hypothesis test,it is irrelevant whether the test is a one-tail or two-tail test.

Accepted Answer

A) True 
 B)False

Question 7

The smaller the p-value,the stronger is the evidence against the null hypothesis.

Accepted Answer

A) True 
 B)False

Question 8

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,state the alternative hypothesis for this study.

Accepted Answer

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

Question 9

For a given level of significance (α),if the sample size n is increased,the probability of a Type II error (β)

Accepted Answer

A) will decrease. 
B) will increase. 
C) will remain the same. 
D) cannot be determined. 
A) will decrease. 
B) will increase. 
C) will remain the same. 
D) cannot be determined.

Question 10

If a researcher rejects a true null hypothesis,she has made a ________ error.

Accepted Answer

The answer of If a researcher rejects a true null...

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 samples 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,what critical value should the company officials use to determine the rejection region?

Accepted Answer

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

Question 12

A major DVD 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 DVD players.It conducts a telephone poll of 300 randomly selected households in the area and finds that 96 have DVD 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. 
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 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 null hypothesis would be rejected.

Accepted Answer

A) True 
 B)False

Question 14

A manager of the credit department for an oil company would like to determine whether the mean monthly balance of credit card holders is equal to $75.An auditor selects a random sample of 100 accounts and finds that the mean owed is $83.40 with a sample standard deviation of $23.65.If you were to conduct a test to determine whether the auditor should conclude that there is evidence that the mean balance is different from $75,which test would you use?

Accepted Answer

A) Z test of a population mean 
B) Z test of a population proportion 
C) t test of population mean 
D) t test of a population proportion 
A) Z test of a population mean 
B) Z test of a population proportion 
C) t test of population mean 
D) t test of a population proportion

Question 15

If the p-value is less than α in a two-tail test,

Accepted Answer

A) the null hypothesis should not be rejected. 
B) the null hypothesis should be rejected. 
C) a one-tail test should be used. 
D) no conclusion should be reached. 
A) the null hypothesis should not be rejected. 
B) the null hypothesis should be rejected. 
C) a one-tail test should be used. 
D) no conclusion should be reached.

Question 16

TABLE 9-2
A student claims that he can correctly identify whether a person is a business major or an agriculture major by the way the person dresses.Suppose in actuality that if someone is a business major,he can correctly identify that person as a business major 87% of the time.When a person is an agriculture major,the student will incorrectly identify that person as a business major 16% of the time.Presented with one person and asked to identify the major of this person (who is either a business or an agriculture major),he considers this to be a hypothesis test with the null hypothesis being that the person is a business major and the alternative that the person is an agriculture major.
-Referring to Table 9-2,what is the "actual confidence coefficient"?

Accepted Answer

A) 0.13 
B) 0.16 
C) 0.84 
D) 0.87 
A) 0.13 
B) 0.16 
C) 0.84 
D) 0.87

Question 17

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 parameter of interest is

Accepted Answer

A) the mean power consumption of the 20 microwave ovens. 
B) the mean power consumption of all such microwave ovens. 
C) 250. 
D) 257.3. 
A) the mean power consumption of the 20 microwave ovens. 
B) the mean power consumption of all such microwave ovens. 
C) 250. 
D) 257.3.

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:
  
-Referring to Table 9-1,the manager can conclude that there is sufficient evidence to show that the mean number of defective bulbs per case is greater than 20 during the morning shift using a level of significance of 0.10.

Accepted Answer

A) True 
 B)False

Question 19

A sample is used to obtain a 95% confidence interval for the mean of a population.The confidence interval goes from 15 to 19.If the same sample had been used to test the null hypothesis that the mean of the population is equal to 20 versus the alternative hypothesis that the mean of the population differs from 20,the null hypothesis could be accepted at a level of significance of 0.01.

Accepted Answer

A) True 
 B)False

Question 20

"What conclusions and interpretations can you reach from the results of the hypothesis test?" is not an important question to ask when performing a hypothesis test.

Accepted Answer

A) True 
 B)False

A Type II error is committed when

In conducting research,you should document both good and bad results.

If a test of hypothesis has a Type I error probability (α)of 0.01,it means that

In a hypothesis test,it is irrelevant whether the test is a one-tail or two-tail test.

The smaller the p-value,the stronger is the evidence against the null hypothesis.

For a given level of significance (α),if the sample size n is increased,the probability of a Type II error (β)

If a researcher rejects a true null hypothesis,she has made a ________ error.

If the p-value is less than α in a two-tail test,

"What conclusions and interpretations can you reach from the results of the hypothesis test?" is not an important question to ask when performing a hypothesis test.

Introduction

Organizing and Visualizing Data

Numerical Descriptive Measures

Basic Probability

Discrete Probability Distributions

The Normal Distribution and Other Continuous Distributions

Sampling and Sampling Distributions

Confidence Interval Estimation

Two-Sample Tests

Analysis of Variance

Chi-Square Tests and Nonparametric Tests

Simple Linear Regression

Introduction to Multiple Regression

Multiple Regression Model Building

Time-Series Forecasting

Statistical Applications in Quality Management

A Roadmap for Analyzing Data

Questions that Involve Online Topics

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

A Type II error is committed when

In conducting research,you should document both good and bad results.

If a test of hypothesis has a Type I error probability (α)of 0.01,it means that

In a hypothesis test,it is irrelevant whether the test is a one-tail or two-tail test.

The smaller the p-value,the stronger is the evidence against the null hypothesis.

For a given level of significance (α),if the sample size n is increased,the probability of a Type II error (β)

If a researcher rejects a true null hypothesis,she has made a ________ error.

If the p-value is less than α in a two-tail test,

"What conclusions and interpretations can you reach from the results of the hypothesis test?" is not an important question to ask when performing a hypothesis test.

Introduction

Organizing and Visualizing Data

Numerical Descriptive Measures

Basic Probability

Discrete Probability Distributions

The Normal Distribution and Other Continuous Distributions

Sampling and Sampling Distributions

Confidence Interval Estimation

Two-Sample Tests

Analysis of Variance

Chi-Square Tests and Nonparametric Tests

Simple Linear Regression

Introduction to Multiple Regression

Multiple Regression Model Building

Time-Series Forecasting

Statistical Applications in Quality Management

A Roadmap for Analyzing Data

Questions that Involve Online Topics

Filters