Question 1

Hypothesis testing is also called

Accepted Answer

A)  Type III error
B)  random testing
C)  effect size
D)  significance testing

Question 2

A null finding is a decision to retain a null hypothesis that is correct.

Accepted Answer

A) True 
 B)False

Question 3

In Step 2 of hypothesis testing,researchers state a level of significance to minimize the probability of

Accepted Answer

A)  rejecting a true null hypothesis
B)  retaining a false null hypothesis
C)  inflating the power of a decision
D)  all of the above

Question 4

The alpha level is basically the same thing as the p value.

Accepted Answer

A) True 
 B)False

Question 5

The test statistic determines whether or not an effect exists in a population;effect size measures the size of an observed effect in a population.

Accepted Answer

A) True 
 B)False

Question 6

When a researcher decides to retain the null hypothesis because the rejection region was located in the wrong tail,this is called a

Accepted Answer

A)  Type I error
B)  Type II error
C)  Type III error
D)  correct decision

Question 7

A researcher reports that the size of an effect in Population A is d = 0.10 and the effect size in Population B is d = 0.34.Which population is associated with greater power to detect an effect?

Accepted Answer

A)  Population A
B)  Population B
C)  They are associated with the same level of power.

Question 8

A researcher obtains z = 1.80 for a one-sample z test.What is the decision for this test at a .05 level of significance?

Accepted Answer

A)  to reject the null hypothesis
B)  to retain the null hypothesis
C)  It depends on whether the test is one-tailed or two-tailed.

Question 9

A large effect size means that Cohen's d is at least equal to .80.

Accepted Answer

A) True 
 B)False

Question 10

The z statistic measures the size of an effect in some population.

Accepted Answer

A) True 
 B)False

Question 11

Is a one-sample z test reported differently for one-tailed and two-tailed tests?

Accepted Answer

A)  No,the same values are reported.
B)  It depends on whether the results were significant.
C)  Yes,only significant results for a two-tailed test are reported.
D)  It can be reported differently when the effect size is large. A

Question 12

Which of the following is a scenario in which increasing sample size will increase power

Accepted Answer

A)  When the effect size is small.
B)  When the effect size is large.
C)  When the probability of a Type I error is small.
D)  All of the above.

Question 13

The value of power is influenced by the alpha level,sample size,and effect size.

Accepted Answer

A) True 
 B)False  True

Question 14

What is the typical level of significance for a hypothesis test in behavioral research?

Accepted Answer

A)  .05
B)  .10
C)  .001
D)  .50

Question 15

________ allows researchers to describe (1) how far mean scores have shifted in the population,or (2) the percentage of variance that can be explained by a given variable.

Accepted Answer

A)  significance
B)  probability
C)  power
D)  effect size D

Question 16

Based on the effect size conventions,d = 0.99 is a

Accepted Answer

A)  small effect size
B)  medium effect size
C)  large effect size

Question 17

A researcher computes a z statistic and obtains z = 2.10.If this were a one-tailed (lower-tail critical)test,then the decision would be to reject the null hypothesis.

Accepted Answer

A) True 
 B)False

Question 18

Researchers directly control for the probability of committing a Type II error.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following is not one of the four steps to hypothesis testing?

Accepted Answer

A)  state the hypotheses
B)  evaluate the plan
C)  set the criteria for a decision
D)  compute the test statistic

Question 20

A Type III error is only possible for hypothesis tests where the rejection region is located in one tail.

Accepted Answer

A) True 
 B)False

Exam 8: Testing Means: One-Sample T Test With Confidence Intervals

Hypothesis testing is also called

Correct AnswerverifiedShow Answer

A null finding is a decision to retain a null hypothesis that is correct.

Correct AnswerverifiedShow Answer

In Step 2 of hypothesis testing,researchers state a level of significance to minimize the probability of

Correct AnswerverifiedShow Answer

The alpha level is basically the same thing as the p value.

Correct AnswerverifiedShow Answer

The test statistic determines whether or not an effect exists in a population;effect size measures the size of an observed effect in a population.

Correct AnswerverifiedShow Answer

When a researcher decides to retain the null hypothesis because the rejection region was located in the wrong tail,this is called a

Correct AnswerverifiedShow Answer

A researcher reports that the size of an effect in Population A is d = 0.10 and the effect size in Population B is d = 0.34.Which population is associated with greater power to detect an effect?

Correct AnswerverifiedShow Answer

A researcher obtains z = 1.80 for a one-sample z test.What is the decision for this test at a .05 level of significance?

Correct AnswerverifiedShow Answer

A large effect size means that Cohen's d is at least equal to .80.

Correct AnswerverifiedShow Answer

The z statistic measures the size of an effect in some population.

Correct AnswerverifiedShow Answer

Is a one-sample z test reported differently for one-tailed and two-tailed tests?

Correct AnswerverifiedA

Which of the following is a scenario in which increasing sample size will increase power

Correct AnswerverifiedShow Answer

The value of power is influenced by the alpha level,sample size,and effect size.

Correct AnswerverifiedTrue

What is the typical level of significance for a hypothesis test in behavioral research?

Correct AnswerverifiedShow Answer

________ allows researchers to describe (1) how far mean scores have shifted in the population,or (2) the percentage of variance that can be explained by a given variable.

Correct AnswerverifiedD

Based on the effect size conventions,d = 0.99 is a

Correct AnswerverifiedShow Answer

A researcher computes a z statistic and obtains z = 2.10.If this were a one-tailed (lower-tail critical)test,then the decision would be to reject the null hypothesis.

Correct AnswerverifiedShow Answer

Researchers directly control for the probability of committing a Type II error.

Correct AnswerverifiedShow Answer

Which of the following is not one of the four steps to hypothesis testing?

Correct AnswerverifiedShow Answer

A Type III error is only possible for hypothesis tests where the rejection region is located in one tail.

Correct AnswerverifiedShow Answer

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A

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True

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D

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