Question 1

For a right-tailed test of hypothesis for a population mean with known σ,the test statistic was z = 1.79.The p-value is

Accepted Answer

A) .0367 
B) .9633 
C) .1186 
D) .0179 
A) .0367 
B) .9633 
C) .1186 
D) .0179 A

Question 2

Given H0: μ ≥ 18 and H1: μ < 18,we would commit a Type I error if we

Accepted Answer

A) conclude that μ ≥ 18 when the truth is that μ < 18. 
B) conclude that μ < 18 when the truth is that μ ≥ 18. 
C) fail to reject μ ≥ 18 when the truth is that μ < 18. 
A) conclude that μ ≥ 18 when the truth is that μ < 18. 
B) conclude that μ < 18 when the truth is that μ ≥ 18. 
C) fail to reject μ ≥ 18 when the truth is that μ < 18. B

Question 3

The decision rule is

Accepted Answer

A) based on the sampling distribution and chosen level of significance. 
B) specified so as to support the researcher's alternative hypothesis. 
C) chosen after selecting the sample and calculating the test statistic. 
D) specified by a panel of expert statisticians elected annually. 
A) based on the sampling distribution and chosen level of significance. 
B) specified so as to support the researcher's alternative hypothesis. 
C) chosen after selecting the sample and calculating the test statistic. 
D) specified by a panel of expert statisticians elected annually. A

Question 4

A false positive in a drug test for steroids is a Type II error.

Accepted Answer

A) True 
 B)False

Question 5

Guidelines for the Jolly Blue Giant Health Insurance Company say that the average hospitalization for a triple hernia operation should not exceed 30 hours.A diligent auditor studied records of 16 randomly chosen triple hernia operations at Hackmore Hospital and found a mean hospital stay of 40 hours with a standard deviation of 20 hours."Aha!" she cried,"the average stay exceeds the guideline." The value of the test statistic for her hypothesis is

Accepted Answer

A) 2.080 
B) 0.481 
C) 1.866 
D) 2.000 
A) 2.080 
B) 0.481 
C) 1.866 
D) 2.000

Question 6

In the hypothesis H0: π = π0,the value of π0 is derived from the sample.

Accepted Answer

A) True 
 B)False

Question 7

You are driving a van packed with camping gear (total weight 3,500 pounds including yourself and family)into a northern wilderness area.You take a "short cut" that turns into a one-lane road,with no room to turn around.After 11 miles you come to a narrow bridge with a faded sign saying,"Safe Up to 2 Tons." About a half-mile ahead,you can see that your road rejoins the main highway.You consider the sign's hypothesis carefully before making a decision.The cost of Type I error is

Accepted Answer

A) that you pass safely over the bridge and everyone's happy. 
B) about $23,900,not including medical bills. 
C) that you will find out just how cold that river actually is. 
D) that your kids will think you are a chicken. 
A) that you pass safely over the bridge and everyone's happy. 
B) about $23,900,not including medical bills. 
C) that you will find out just how cold that river actually is. 
D) that your kids will think you are a chicken.

Question 8

The level of significance is not

Accepted Answer

A) the probability of a "false rejection." 
B) a value between 0 and 1. 
C) the likelihood of rejecting the null hypothesis when it is true. 
D) the chance of accepting a true null hypothesis. 
A) the probability of a "false rejection." 
B) a value between 0 and 1. 
C) the likelihood of rejecting the null hypothesis when it is true. 
D) the chance of accepting a true null hypothesis.

Question 9

Regarding the probability of Type I error (α)and Type II error (β),which statement is true?

Accepted Answer

A) β > α B) β < α C) α + β = 1 D) Power = 1 − β. A) β > α B) β < α C) α + β = 1 D) Power = 1 − β.

Question 10

Last year,10 percent of all teenagers in Greenville purchased a new iPhone.This year,a sample of 260 randomly chosen Greenville teenagers showed that 39 had purchased a new iPhone.To test whether the percentage has risen,the p-value is approximately

Accepted Answer

A) .0501 
B) .0314 
C) .0492 
D) .0036 
A) .0501 
B) .0314 
C) .0492 
D) .0036

Question 11

In testing the hypotheses H0: π ≤ π0,H1: π > π0,we would use a

Accepted Answer

A) two-tailed test. 
B) left-tailed test. 
C) right-tailed test. 
D) breathalyzer test. 
A) two-tailed test. 
B) left-tailed test. 
C) right-tailed test. 
D) breathalyzer test.

Question 12

Which statement about α is not correct?

Accepted Answer

A) It is the probability of committing a Type I error. 
B) It is the test's significance level. 
C) It is the probability of rejecting a true H0. 
D) It is equal to 1 − β. 
A) It is the probability of committing a Type I error. 
B) It is the test's significance level. 
C) It is the probability of rejecting a true H0. 
D) It is equal to 1 − β.

Question 13

For tests of a mean,if other factors are held constant,which statement is correct?

Accepted Answer

A) The critical value of Student's t increases as n increases. 
B) A test statistic tcalc = 1.853 with n = 16 leads to rejection at α = .05 in a one-tailed test. 
C) It is harder to reject the null hypothesis in a two-tailed test rather than a one-tailed test. 
D) If we desire α = .10,then a p-value of .13 would lead us to reject the null hypothesis. 
A) The critical value of Student's t increases as n increases. 
B) A test statistic tcalc = 1.853 with n = 16 leads to rejection at α = .05 in a one-tailed test. 
C) It is harder to reject the null hypothesis in a two-tailed test rather than a one-tailed test. 
D) If we desire α = .10,then a p-value of .13 would lead us to reject the null hypothesis.

Question 14

After testing a hypothesis,we decided to reject the null hypothesis.Thus,we are exposed to

Accepted Answer

A) Type I error. 
B) Type II error. 
C) either Type I or Type II error. 
D) neither Type I nor Type II error. 
A) Type I error. 
B) Type II error. 
C) either Type I or Type II error. 
D) neither Type I nor Type II error.

Question 15

"Currently,only 20 percent of arrested drug pushers are convicted," cried candidate Courageous Calvin in a campaign speech."Elect me and you'll see a big increase in convictions." A year after his election,a random sample of 144 case files of arrested drug pushers showed 36 convictions.For a right-tailed test,the p-value is approximately

Accepted Answer

A) .9332 
B) .0668 
C) .0435 
D) .0250 
A) .9332 
B) .0668 
C) .0435 
D) .0250

Question 16

Which of the following decisions could result in a Type II error for a test?

Accepted Answer

A) Reject the alternative hypothesis. 
B) Reject the null hypothesis. 
C) Fail to reject the null hypothesis. 
D) Make no decision. 
A) Reject the alternative hypothesis. 
B) Reject the null hypothesis. 
C) Fail to reject the null hypothesis. 
D) Make no decision.

Question 17

Which of the following is incorrect?

Accepted Answer

A) The level of significance is the probability of making a Type I error. 
B) Lowering both α and β at once will require a larger sample size. 
C) The probability of rejecting a true null hypothesis increases as n increases. 
D) When Type I error increases,Type II error must decrease,ceteris paribus. 
A) The level of significance is the probability of making a Type I error. 
B) Lowering both α and β at once will require a larger sample size. 
C) The probability of rejecting a true null hypothesis increases as n increases. 
D) When Type I error increases,Type II error must decrease,ceteris paribus.

Question 18

Hypothesis tests for a mean using the critical value method require

Accepted Answer

A) using a two-tailed test. 
B) sampling a normal population. 
C) knowing the true population mean. 
D) specifying α in advance. 
A) using a two-tailed test. 
B) sampling a normal population. 
C) knowing the true population mean. 
D) specifying α in advance.

Question 19

The probability of rejecting a true null hypothesis is the significance level of the test.

Accepted Answer

A) True 
 B)False

Question 20

Power is the probability of rejecting the null hypothesis when it is false and is equal to 1 − β.

Accepted Answer

A) True 
 B)False

For a right-tailed test of hypothesis for a population mean with known σ,the test statistic was z = 1.79.The p-value is

Given H0: μ ≥ 18 and H1: μ < 18,we would commit a Type I error if we

The decision rule is

A false positive in a drug test for steroids is a Type II error.

In the hypothesis H0: π = π0,the value of π0 is derived from the sample.

The level of significance is not

Regarding the probability of Type I error (α)and Type II error (β),which statement is true?

Last year,10 percent of all teenagers in Greenville purchased a new iPhone.This year,a sample of 260 randomly chosen Greenville teenagers showed that 39 had purchased a new iPhone.To test whether the percentage has risen,the p-value is approximately

In testing the hypotheses H0: π ≤ π0,H1: π > π0,we would use a

Which statement about α is not correct?

For tests of a mean,if other factors are held constant,which statement is correct?

After testing a hypothesis,we decided to reject the null hypothesis.Thus,we are exposed to

Which of the following decisions could result in a Type II error for a test?

Which of the following is incorrect?

Hypothesis tests for a mean using the critical value method require

The probability of rejecting a true null hypothesis is the significance level of the test.

Power is the probability of rejecting the null hypothesis when it is false and is equal to 1 − β.

Overview of Statistics

Data Collection

Describing Data Visually

Descriptive Statistics

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Chi-Square Tests

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Exam 9: One-Sample Hypothesis Tests

For a right-tailed test of hypothesis for a population mean with known σ,the test statistic was z = 1.79.The p-value is

Given H0: μ ≥ 18 and H1: μ < 18,we would commit a Type I error if we

The decision rule is

A false positive in a drug test for steroids is a Type II error.

In the hypothesis H0: π = π0,the value of π0 is derived from the sample.

The level of significance is not

Regarding the probability of Type I error (α)and Type II error (β),which statement is true?

Last year,10 percent of all teenagers in Greenville purchased a new iPhone.This year,a sample of 260 randomly chosen Greenville teenagers showed that 39 had purchased a new iPhone.To test whether the percentage has risen,the p-value is approximately

In testing the hypotheses H0: π ≤ π0,H1: π > π0,we would use a

Which statement about α is not correct?

For tests of a mean,if other factors are held constant,which statement is correct?

After testing a hypothesis,we decided to reject the null hypothesis.Thus,we are exposed to

Which of the following decisions could result in a Type II error for a test?

Which of the following is incorrect?

Hypothesis tests for a mean using the critical value method require

The probability of rejecting a true null hypothesis is the significance level of the test.

Power is the probability of rejecting the null hypothesis when it is false and is equal to 1 − β.

Overview of Statistics

Data Collection

Describing Data Visually

Descriptive Statistics

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Chi-Square Tests

Filters