Question 1

A significant treatment effect does not necessarily indicate a large treatment effect.

Accepted Answer

A) True 
 B)False

Question 2

The null hypothesis is stated in terms of the population, even though the data come from a sample.

Accepted Answer

A) True 
 B)False

Question 3

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 4

Most researchers would like the hypothesis test to reject the null hypothesis.

Accepted Answer

A) True 
 B)False

Question 5

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 n = 25
B)  σ = 5 and n = 50
C)  σ = 10 and n = 25
D)  σ = 10 and n = 50E) A) and C)
F) A) and D)

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.E) A) and B)
F) All of the above

Question 7

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 = .05E) A) and B)
F) C) and D)

Question 8

Which of the following accurately describes the critical region?

Accepted Answer

A)  outcomes with a very low probability if the null hypothesis is true
B)  outcomes with a high probability if the null hypothesis is true
C)  outcomes with a very low probability whether or not the null hypothesis is true
D)  outcomes with a high probability whether or not the null hypothesis is trueE) None of the above
F) A) and B)

Question 9

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 10

Which combination of factors will increase the chances of rejecting the null hypothesis?

Accepted Answer

A)  a large standard error and a large alpha level
B)  a large standard error and a small alpha level
C)  a small standard error and a large alpha level
D)  a small standard error and a small alpha levelE) None of the above
F) C) and D)

Question 11

If a research report includes the term significant result, it means that the null hypothesis was rejected.

Accepted Answer

A) True 
 B)False

Question 12

Under what circumstances can a very small treatment effect can still be significant?

Accepted Answer

A)  if the sample size (n)  is very large
B)  if the sample standard deviation (σ)  is very large
C)  if the standard error of M (σ M)  is very large
D)  All of the other factors are likely to produce a significant result.E) A) and C)
F) C) and D)

Question 13

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 aboveE) None of the above
F) A) and D)

Question 14

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 µE) None of the above
F) A) and C)

Question 15

A two-tailed hypothesis test is being used to evaluate a treatment effect with ? = .05.If the sample data produce a z-score of z = -2.24, then 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.E) B) and D)
F) B) and C)

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

When is there a risk of a Type I error?

Accepted Answer

A)  whenever H0 is rejected
B)  whenever H1 is rejected
C)  whenever the decision is "fail to reject H0"
D)  The risk of a Type I error is independent of the decision from a hypothesis test.E) C) and D)
F) A) and B)

Question 18

Even if a treatment has an effect it is still possible to obtain a sample mean that is very similar to the original population mean.What outcome is likely if this happens?

Accepted Answer

A)  reject H0 and make a Type I error
B)  correctly reject H0 
C)  fail to reject H0 and make a Type II error
D)  correctly fail to reject H0E) All of the above
F) A) and B)

Question 19

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 20

A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population which is known to have a mean of μ = 80.The results will be examined using a one-tailed hypothesis test.Which of the following is the correct statement of the null hypothesis?

Accepted Answer

A)  μ > 80
B)  μ ≥ 80
C)  μ 
D)  μ ≤ 80E) B) and C)
F) A) and D)

Exam 8: Introduction to Hypothesis Testing

Even if a treatment has an effect it is still possible to obtain a sample mean that is very similar to the original population mean.What outcome is likely if this happens?

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

A significant treatment effect does not necessarily indicate a large treatment effect.

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

When is there a risk of a Type I error?

Correct Answer
verified

Most researchers would like the hypothesis test to reject the null hypothesis.

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

Which combination of factors will increase the chances of rejecting the null hypothesis?

Correct Answer
verified

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.

Correct Answer
verified

If a research report includes the term significant result, it means that the null hypothesis was rejected.

Correct Answer
verified

Which of the following accurately describes the critical region?

Correct Answer
verified

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

Correct Answer
verified

The null hypothesis is stated in terms of the population, even though the data come from a sample.

Correct Answer
verified

Under what circumstances can a very small treatment effect can still be significant?

Correct Answer
verified

Exam 8: Introduction to Hypothesis Testing

Even if a treatment has an effect it is still possible to obtain a sample mean that is very similar to the original population mean.What outcome is likely if this happens?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A significant treatment effect does not necessarily indicate a large treatment effect.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

When is there a risk of a Type I error?

Correct AnswerverifiedShow Answer

Most researchers would like the hypothesis test to reject the null hypothesis.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which combination of factors will increase the chances of rejecting the null hypothesis?

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

If a research report includes the term significant result, it means that the null hypothesis was rejected.

Correct AnswerverifiedShow Answer

Which of the following accurately describes the critical region?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The null hypothesis is stated in terms of the population, even though the data come from a sample.

Correct AnswerverifiedShow Answer

Under what circumstances can a very small treatment effect can still be significant?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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