Which of the following statements is true with respect to sample size?
a) use small samples when mailing questionnaires
b) the greater the number of subgroups of interest to the study, the larger the sample
c) more subjects are always better
d) large samples increase sampling error
In a 2 (age) x 2 (type of therapy) factorial design, which of the following outcomes would be an example of an interaction?
a. young adults do better in therapy A; older adults also do better with this therapy
b. therapy A works better for young adults, while therapy B works better for older adults
c. therapy B works better overall, and this is true for both young and old adults
d. older adults improve more than younger adults, regardless of type of therapy
Survey research is appropriate for which of the following situations?
a. to measure individuals' attitudes
b. to track changes in beliefs over time
c. to test theoretical models
d. all of the above
What is one way to obtain a criterion validity estimate?
a) ask an expert for his or her opinion
b) assess the underlying construct on which the test is based and correlate these scores with the test scores
c) select a criterion and correlate scores on the test with scores on the criterion
d) obtain a Pearson Product Moment correlation coefficient for two different forms of the test given at different times
Which of the following graphs is most appropriate when displaying categorical data?
a. scatterplot
b. bar graph
c. histogram
d. any of the above
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