Chapter 13

Question 1

Keisha has conducted a study measuring the number of times psychology students ask questions in class and has correlated this with their end of course grade

Answer 1

A. This is a descriptive statistic study
B. This is an inferential statistic study**
C. This is an inappropriate use of statistics
D. Without a hypothesis statement nothing can be said

Question 2

Skewed distributions effect results by________.

Answer 2

A. Increasing the likelihood of falsely rejecting the null hypothesis
B. Increasing the likelihood of falsely accepting the null hypothesis
C. Both A and B**
D. None of the above

Question 3

Jena runs a couples’ therapy group and tests the couples marital satisfaction at the beginning and end of the group.

Answer 3

A. She should use a repeated measures t-test***
B. She should use an independent measures t-test
C. She should correlate pre- and post-measures
D. She should use descriptive statistics only

Question 4

Jena runs a couples’ therapy group and tests the couples marital satisfaction at the beginning and end of the group, as well as for gender differences.

Answer 4

A. She should use a one-way ANOVA with repeated measures
B. She should use a two-way ANOVA
C. She should use a two-way ANOVA with repeated measures**

Question 5

Jena wants to know prior to couples group whether an ordinal variable of years of marriage (i.e., 0-1, 2-5, or >6) is independent of overall marital satisfaction coded “happiness” (1) or “unhappiness” (2).

Answer 5

A. Conduct a chi-square test**
B. Conduct a Pearson correlation
C. Conduct an independent t-test

Question 6

Which answer is wrong?

Answer 6

A. r ranges from +1 to -1
B. rho ranges from +1 to -1
C. r requires normal distributions
D. rho correlates rank orders 
E. none are wrong*****