Question 1

In a hypothesis test,the likelihood of rejecting the null hypothesis is independent of the sample size.

Accepted Answer

A) True 
 B)False

Question 2

By selecting a larger alpha level,a researcher is ______.

Accepted Answer

A) attempting to make it easier to reject H0 
B) better able to detect a treatment effect 
C) increasing the risk of a Type I error 
D) All of the other options are the result of selecting a larger alpha level. 
A) attempting to make it easier to reject H0 
B) better able to detect a treatment effect 
C) increasing the risk of a Type I error 
D) All of the other options are the result of selecting a larger alpha level.

Question 3

What is measured by the numerator of the z-score test statistic?

Accepted Answer

A) The average distance between M and µ that would be expected if H0 was true 
B) The actual distance between M and µ 
C) The position of the sample mean relative to the critical region 
D) Whether or not there is a significant difference between M and µ 
A) The average distance between M and µ that would be expected if H0 was true 
B) The actual distance between M and µ 
C) The position of the sample mean relative to the critical region 
D) Whether or not there is a significant difference between M and µ

Question 4

Which of the following accurately describes the effect of increasing the alpha level?

Accepted Answer

A) Increases the standard error and has no effect on the risk of a Type I error 
B) Decreases the standard error and has no effect on the risk of a Type I error 
C) Increases the risk of a Type I error and has no effect on the standard error 
D) Decreases the risk of a Type I error and has no effect on the standard error 
A) Increases the standard error and has no effect on the risk of a Type I error 
B) Decreases the standard error and has no effect on the risk of a Type I error 
C) Increases the risk of a Type I error and has no effect on the standard error 
D) Decreases the risk of a Type I error and has no effect on the standard error

Question 5

A researcher evaluates a treatment effect using a one-tailed hypothesis test with F1F1F1S1F1F1F10 = .05,and the decision is to reject the null hypothesis.If the researcher switched to a two-tailed test using the same sample,what decision would be made?

Accepted Answer

A) Definitely reject the null hypothesis with either F1F1F1S1F1F1F10 = .05 or with F1F1F1S1F1F1F10 = .01 
B) Definitely reject the null hypothesis with F1F1F1S1F1F1F10 = .05 and maybe reject with F1F1F1S1F1F1F10 = .01 
C) Might reject the null hypothesis with F1F1F1S1F1F1F10 = .05 but might not 
D) Definitely fail to reject the null hypothesis with either F1F1F1S1F1F1F10 = .05 or with F1F1F1S1F1F1F10 = .01 
A) Definitely reject the null hypothesis with either F1F1F1S1F1F1F10 = .05 or with F1F1F1S1F1F1F10 = .01 
B) Definitely reject the null hypothesis with F1F1F1S1F1F1F10 = .05 and maybe reject with F1F1F1S1F1F1F10 = .01 
C) Might reject the null hypothesis with F1F1F1S1F1F1F10 = .05 but might not 
D) Definitely fail to reject the null hypothesis with either F1F1F1S1F1F1F10 = .05 or with F1F1F1S1F1F1F10 = .01

Question 6

A treatment is administered to a sample of n = 9 individuals selected from a population with a mean of µ = 80 and a standard deviation of σ = 12.After treatment,the effect size is measured by computing Cohen's d,and a value of d = 0.50 is obtained.Based on this information,what is the mean for the treated sample?

Accepted Answer

A) M = 6 
B) M = 82 
C) M = 86 
D) Cannot answer without knowing the sample size 
A) M = 6 
B) M = 82 
C) M = 86 
D) Cannot answer without knowing the sample size

Question 7

The null hypothesis states that the sample mean (after treatment)is equal to the original population mean (before treatment).

Accepted Answer

A) True 
 B)False

Question 8

A researcher administers a treatment to a sample of participants selected from a population with µ = 80.If the researcher obtains a sample mean of M = 88,which combination of factors is most likely to result in rejecting the null hypothesis?

Accepted Answer

A) σ = 5 and α = .01 
B) σ = 5 and α = .05 
C) σ = 10 and α = .01 
D) σ = 10 and α = .05 
A) σ = 5 and α = .01 
B) σ = 5 and α = .05 
C) σ = 10 and α = .01 
D) σ = 10 and α = .05

Question 9

A hypothesis test involves a comparison of which two elements?

Accepted Answer

A) Research results from a sample and a hypothesis about a population 
B) Research results from a population and a hypothesis about a sample 
C) Research results from a population and a hypothesis about the population 
D) Research results from a sample and a hypothesis about the sample 
A) Research results from a sample and a hypothesis about a population 
B) Research results from a population and a hypothesis about a sample 
C) Research results from a population and a hypothesis about the population 
D) Research results from a sample and a hypothesis about the sample

Question 10

A researcher selects a sample and administers a treatment to the individuals in the sample.If the sample is used for a hypothesis test,what does the null hypothesis (H0)say about the treatment?

Accepted Answer

A) The treatment causes a change in the scores. 
B) The treatment adds a constant to each score. 
C) The treatment multiplies each score by a constant. 
D) The treatment has no effect on the scores. 
A) The treatment causes a change in the scores. 
B) The treatment adds a constant to each score. 
C) The treatment multiplies each score by a constant. 
D) The treatment has no effect on the scores.

Question 11

If the sample data are in the critical region with α = .05,then the same sample data would still be in the critical region if α were changed to .01.

Accepted Answer

A) True 
 B)False

Question 12

If other factors are held constant,lowering the alpha level will increase the power of a hypothesis test.

Accepted Answer

A) True 
 B)False

Question 13

You can reduce the risk of a Type I error by using a larger sample.

Accepted Answer

A) True 
 B)False

Question 14

A Type I error occurs when a treatment has no effect but the decision is to reject the null hypothesis.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following accurately describes a hypothesis test?

Accepted Answer

A) A descriptive technique that allows researchers to describe a sample 
B) A descriptive technique that allows researchers to describe a population 
C) An inferential technique that uses the data from a sample to draw inferences about a population 
D) An inferential technique that uses information about a population to make predictions about a sample 
A) A descriptive technique that allows researchers to describe a sample 
B) A descriptive technique that allows researchers to describe a population 
C) An inferential technique that uses the data from a sample to draw inferences about a population 
D) An inferential technique that uses information about a population to make predictions about a sample

Question 16

In most situations,researchers would like the hypothesis test to reject the null hypothesis.

Accepted Answer

A) True 
 B)False

Question 17

A two-tailed hypothesis test is being used to evaluate a treatment effect with α = .05.If the sample data produce a z-score of z = F1F1F1S1F1F1F102.24,what is the correct decision?

Accepted Answer

A) Reject the null hypothesis and conclude that the treatment has no effect 
B) Reject the null hypothesis and conclude that the treatment has an effect 
C) Fail to reject the null hypothesis and conclude that the treatment has no effect 
D) Fail to reject the null hypothesis and conclude that the treatment has an effect 
A) Reject the null hypothesis and conclude that the treatment has no effect 
B) Reject the null hypothesis and conclude that the treatment has an effect 
C) Fail to reject the null hypothesis and conclude that the treatment has no effect 
D) Fail to reject the null hypothesis and conclude that the treatment has an effect

Question 18

A sample of n = 25 individuals is selected from a population with µ = 80,and a treatment is administered to the sample.What is expected if the treatment has no effect?

Accepted Answer

A) The sample mean should be very different from 80 and should lead you to reject the null hypothesis. 
B) The sample mean should be very different from 80 and should lead you to fail to reject the null hypothesis. 
C) The sample mean should be close to 80 and should lead you to reject the null hypothesis. 
D) The sample mean should be close 80 and should lead you to fail to reject the null hypothesis. 
A) The sample mean should be very different from 80 and should lead you to reject the null hypothesis. 
B) The sample mean should be very different from 80 and should lead you to fail to reject the null hypothesis. 
C) The sample mean should be close to 80 and should lead you to reject the null hypothesis. 
D) The sample mean should be close 80 and should lead you to fail to reject the null hypothesis.

Question 19

You complete a hypothesis test using F1F1F1S1F1F1F10 = .05,and based on the evidence from the sample,your decision is to reject the null hypothesis.Which of the following is true?

Accepted Answer

A) You have made a Type I error. 
B) You have made a Type II error. 
C) You might have made a Type I error,but the probability is less than 5%. 
D) You have made the correct decision. 
A) You have made a Type I error. 
B) You have made a Type II error. 
C) You might have made a Type I error,but the probability is less than 5%. 
D) You have made the correct decision.

Question 20

If a hypothesis test is found to have power = 0.70,what is the probability that the test will result in a Type II error?

Accepted Answer

A) 0.30 
B) 0.70 
C) p > 0.70 
D) Cannot determine without more information 
A) 0.30 
B) 0.70 
C) p > 0.70 
D) Cannot determine without more information

In a hypothesis test,the likelihood of rejecting the null hypothesis is independent of the sample size.

By selecting a larger alpha level,a researcher is ______.

What is measured by the numerator of the z-score test statistic?

Which of the following accurately describes the effect of increasing the alpha level?

A researcher evaluates a treatment effect using a one-tailed hypothesis test with  = .05,and the decision is to reject the null hypothesis.If the researcher switched to a two-tailed test using the same sample,what decision would be made?

The null hypothesis states that the sample mean (after treatment)is equal to the original population mean (before treatment).

A researcher administers a treatment to a sample of participants selected from a population with µ = 80.If the researcher obtains a sample mean of M = 88,which combination of factors is most likely to result in rejecting the null hypothesis?

A hypothesis test involves a comparison of which two elements?

A researcher selects a sample and administers a treatment to the individuals in the sample.If the sample is used for a hypothesis test,what does the null hypothesis (H₀)say about the treatment?

If the sample data are in the critical region with α = .05,then the same sample data would still be in the critical region if α were changed to .01.

If other factors are held constant,lowering the alpha level will increase the power of a hypothesis test.

You can reduce the risk of a Type I error by using a larger sample.

A Type I error occurs when a treatment has no effect but the decision is to reject the null hypothesis.

Which of the following accurately describes a hypothesis test?

In most situations,researchers would like the hypothesis test to reject the null hypothesis.

A two-tailed hypothesis test is being used to evaluate a treatment effect with α = .05.If the sample data produce a z-score of z = 2.24,what is the correct decision?

A sample of n = 25 individuals is selected from a population with µ = 80,and a treatment is administered to the sample.What is expected if the treatment has no effect?

You complete a hypothesis test using  = .05,and based on the evidence from the sample,your decision is to reject the null hypothesis.Which of the following is true?

If a hypothesis test is found to have power = 0.70,what is the probability that the test will result in a Type II error?

Introduction to Statistics

Frequency Distributions

Measures of Central Tendency

Measures of Variability

Z-Scores

Probability

Probability and Samples:

Introduction to the T Statistic

The T Test for Two Independent Samples

The T Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures and Two-Factor Anova

Correlation and Regression

Chi-Square Tests

Filters

Exam 8: Introduction to Hypothesis Testing

In a hypothesis test,the likelihood of rejecting the null hypothesis is independent of the sample size.

By selecting a larger alpha level,a researcher is ______.

What is measured by the numerator of the z-score test statistic?

Which of the following accurately describes the effect of increasing the alpha level?

A researcher evaluates a treatment effect using a one-tailed hypothesis test with  = .05,and the decision is to reject the null hypothesis.If the researcher switched to a two-tailed test using the same sample,what decision would be made?

The null hypothesis states that the sample mean (after treatment)is equal to the original population mean (before treatment).

A researcher administers a treatment to a sample of participants selected from a population with µ = 80.If the researcher obtains a sample mean of M = 88,which combination of factors is most likely to result in rejecting the null hypothesis?

A hypothesis test involves a comparison of which two elements?

A researcher selects a sample and administers a treatment to the individuals in the sample.If the sample is used for a hypothesis test,what does the null hypothesis (H0)say about the treatment?

If the sample data are in the critical region with α = .05,then the same sample data would still be in the critical region if α were changed to .01.

If other factors are held constant,lowering the alpha level will increase the power of a hypothesis test.

You can reduce the risk of a Type I error by using a larger sample.

A Type I error occurs when a treatment has no effect but the decision is to reject the null hypothesis.

Which of the following accurately describes a hypothesis test?

In most situations,researchers would like the hypothesis test to reject the null hypothesis.

A two-tailed hypothesis test is being used to evaluate a treatment effect with α = .05.If the sample data produce a z-score of z = 2.24,what is the correct decision?

A sample of n = 25 individuals is selected from a population with µ = 80,and a treatment is administered to the sample.What is expected if the treatment has no effect?

You complete a hypothesis test using  = .05,and based on the evidence from the sample,your decision is to reject the null hypothesis.Which of the following is true?

If a hypothesis test is found to have power = 0.70,what is the probability that the test will result in a Type II error?

Introduction to Statistics

Frequency Distributions

Measures of Central Tendency

Measures of Variability

Z-Scores

Probability

Probability and Samples:

Introduction to the T Statistic

The T Test for Two Independent Samples

The T Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures and Two-Factor Anova

Correlation and Regression

Chi-Square Tests

Filters

A researcher selects a sample and administers a treatment to the individuals in the sample.If the sample is used for a hypothesis test,what does the null hypothesis (H₀)say about the treatment?