Question 1

In testing the difference between two sample means, you would examine the ______ of the two groups to test the assumption of homogeneity of variance.

Accepted Answer

A)   standard deviations
B)   t-tests
C)   means
D)   sample sizesE) None of the above
F) C) and D)

Question 2

For a group of 18 participants, how many degrees of freedom are there for a t-test for dependent means?

Accepted Answer

A)   36
B)   35
C)   18
D)   17E) A) and B)
F) A) and C)

Question 3

A researcher hypothesizes that women are more in favor of gun control than are men. In conducting an analysis to test this hypothesis, how should the null hypothesis be stated?

Accepted Answer

A)   H0: μD = 0
B)   H0: Women > Men
C)   H0: Women = Men
D)   H0: μ1 = μ2E) A) and D)
F) A) and C)

Question 4

When do you determine whether the probability of a statistic such as the t-test is less than .01?

Accepted Answer

A)   when you have rejected the null hypothesis
B)   when you have not rejected the null hypothesis
C)   when you have already concluded that p > .01
D)   when you have already concluded that p > .05E) A) and B)
F) B) and C)

Question 5

In testing the difference between two sample means  , a negative (-)  value of the t-statistic (t)  indicates ______.

Accepted Answer

A)   the sample mean is greater than the hypothesized population mean
B)   the score is less than the mean
C)   the second group's mean is larger than the first group's mean
D)   you've made an error in your calculationsE) A) and C)
F) None of the above

Question 6

For a t-statistic = 2.56 with 20 degrees of freedom, what would be the appropriate statement about the significance level?

Accepted Answer

A)   p 
B)   p > .05
C)   p 
D)   p > .01E) All of the above
F) None of the above

Question 7

In conducting the t-test for dependent means, the difference score (D)  is calculated by subtracting ______.

Accepted Answer

A)   the higher score from the lower score
B)   the lower score from the higher score
C)   the second score from the first score
D)   the first score from the second scoreE) A) and B)
F) B) and C)

Question 8

A researcher states the following hypotheses: H0: μMales = μ Females and H1: μMales ≠ μFemales. Assuming she collects data from 15 males and 15 females, what is the appropriate critical value?

Accepted Answer

A)   1.697
B)   1.701
C)   2.042
D)   2.048E) None of the above
F) A) and B)

Question 9

Which type of statistic would be appropriate for analyzing a within-subjects research design?

Accepted Answer

A)   z-test for one mean
B)   t-test for independent means
C)   t-test for dependent means
D)   t-test for one meanE) None of the above
F) B) and C)

Question 10

The ______ symbol is part of the ______ hypothesis, and implies this hypothesis is ______.

Accepted Answer

A)   ≠; null; directional
B)   =; alternative; directional
C)   ≠; alternative; two-tailed
D)   ; null; non-directionalE) B) and C)
F) None of the above

Question 11

This distribution illustrates a ______.

Accepted Answer

A)   directional null hypothesis
B)   non-directional alternative hypothesis
C)   non-directional null hypothesis
D)   directional alternative hypothesisE) None of the above
F) C) and D)

Question 12

This distribution illustrates a ______.

Accepted Answer

A)   directional null hypothesis
B)   directional alternative hypothesis
C)   non-directional alternative hypothesis
D)   non-directional null hypothesisE) A) and C)
F) A) and B)

Question 13

In testing the difference between two sample means  , the greater the difference between the two means, the more the value of the t-statistic (t)  differs from ______.

Accepted Answer

A)   0
B)   μ
C)   the alternative hypothesis
D)   the region of rejectionE) None of the above
F) A) and B)

Question 14

What did the researcher do to cause the change in the shaded regions from Distribution A to Distribution B?  Distribution A  Distribution B

Accepted Answer

A)   She increased the size of her sample.
B)   She changed alpha from .05 to .10.
C)   She changed from a directional to a non-directional alternative hypothesis.
D)   She calculated a t-test rather than an F-ratio.E) A) and B)
F) B) and C)

Question 15

A study compares the means of two groups, each having N = 10. If the standard deviations in the two groups are 4.00 and 6.00, what is the value for the standard error of the difference  ?

Accepted Answer

A)   2.28
B)   1.00
C)   10.00
D)   5.20E) All of the above
F) A) and C)

Question 16

In reporting a statistical analysis, a researcher writes "p > .05". By definition this implies that ______.

Accepted Answer

A)   the null hypothesis was rejected
B)   p 
C)   the statistic was in the region of rejection
D)   the means of the groups are not different from each otherE) A) and B)
F) B) and C)

Question 17

When you ______, this implies the probability of the statistic is ______.

Accepted Answer

A)   do not reject the null hypothesis; in the region of rejection
B)   do not reject the null hypothesis; 
C)   do not reject the null hypothesis; high
D)   reject the null hypothesis; in the region of acceptanceE) A) and D)
F) A) and C)

Question 18

For a t-statistic = 3.20 with 10 degrees of freedom, what would be the appropriate statement about the significance level?

Accepted Answer

A)   p > .01
B)   p 
C)   p 
D)   p > .05E) A) and D)
F) C) and D)

Question 19

Holding all else constant, as sample sizes increase, the degrees of freedom ______ and the critical value(s)  ______.

Accepted Answer

A)   decrease; decrease
B)   decrease; increase
C)   increase; increase
D)   increase; decreaseE) B) and C)
F) A) and B)

Question 20

A researcher hypothesizes that nurses have higher average salaries than teachers. In conducting an analysis to test this hypothesis, how might the alternative hypothesis be stated?

Accepted Answer

A)   H1: μD = 0
B)   H1: μD ≠ 0
C)   H1: μNurses's salaries ≠ μTeacher's salaries
D)   H1: μNurses ≠ μTeachersE) A) and B)
F) A) and C)

Exam 9: Testing the Difference Between Two Means

Holding all else constant, as sample sizes increase, the degrees of freedom ______ and the critical value(s) ______.

Correct AnswerverifiedShow Answer

What did the researcher do to cause the change in the shaded regions from Distribution A to Distribution B? Distribution A Distribution B

Correct AnswerverifiedShow Answer

A study compares the means of two groups, each having N = 10. If the standard deviations in the two groups are 4.00 and 6.00, what is the value for the standard error of the difference ?

Correct AnswerverifiedShow Answer

For a t-statistic = 3.20 with 10 degrees of freedom, what would be the appropriate statement about the significance level?

Correct AnswerverifiedShow Answer

In testing the difference between two sample means , a negative (-) value of the t-statistic (t) indicates ______.

Correct AnswerverifiedShow Answer

A researcher hypothesizes that nurses have higher average salaries than teachers. In conducting an analysis to test this hypothesis, how might the alternative hypothesis be stated?

Correct AnswerverifiedShow Answer

When do you determine whether the probability of a statistic such as the t-test is less than .01?

Correct AnswerverifiedShow Answer

This distribution illustrates a ______.

Correct AnswerverifiedShow Answer

A researcher hypothesizes that women are more in favor of gun control than are men. In conducting an analysis to test this hypothesis, how should the null hypothesis be stated?

Correct AnswerverifiedShow Answer

In testing the difference between two sample means, you would examine the ______ of the two groups to test the assumption of homogeneity of variance.

Correct AnswerverifiedShow Answer

The ______ symbol is part of the ______ hypothesis, and implies this hypothesis is ______.

Correct AnswerverifiedShow Answer

For a group of 18 participants, how many degrees of freedom are there for a t-test for dependent means?

Correct AnswerverifiedShow Answer

In conducting the t-test for dependent means, the difference score (D) is calculated by subtracting ______.

Correct AnswerverifiedShow Answer

A researcher states the following hypotheses: H0: μMales = μ Females and H1: μMales ≠ μFemales. Assuming she collects data from 15 males and 15 females, what is the appropriate critical value?

Correct AnswerverifiedShow Answer

In reporting a statistical analysis, a researcher writes "p > .05". By definition this implies that ______.

Correct AnswerverifiedShow Answer

When you ______, this implies the probability of the statistic is ______.

Correct AnswerverifiedShow Answer

In testing the difference between two sample means , the greater the difference between the two means, the more the value of the t-statistic (t) differs from ______.

Correct AnswerverifiedShow Answer

This distribution illustrates a ______.

Correct AnswerverifiedShow Answer

For a t-statistic = 2.56 with 20 degrees of freedom, what would be the appropriate statement about the significance level?

Correct AnswerverifiedShow Answer

Which type of statistic would be appropriate for analyzing a within-subjects research design?

Correct AnswerverifiedShow Answer

Holding all else constant, as sample sizes increase, the degrees of freedom and the critical value(s) .

Correct Answer
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The symbol is part of the hypothesis, and implies this hypothesis is __.

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A researcher states the following hypotheses: H₀: μMales = μ Females and H₁: μMales ≠ μFemales. Assuming she collects data from 15 males and 15 females, what is the appropriate critical value?

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When you , this implies the probability of the statistic is .

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