1. A psychologist wants to know whether there are personality differences among college students who, if given an option, would wake up early during the week compared to those who would opt to sleep in. She will be constructing the groups by only interviewing students who fall on the extremes of preferred sleep (early wake vs. sleep in). What kind of variable is she making?

A. a nominal (subject) variable

B. an interval (continuous) scale variable

C. a ratio scale variable

D. a random assignment variable

2. A study is looking at whether the average amount of student drinking on the weekend predicts the amount of time spent on homework. In this example, amount of drinking is the:

A. dependent variable

B. independent variable

C. extraneous variable

D. categorical variable

3. Which of the following levels of measurement differentiates between classification and magnitude, but lacks equal intervals between values?

A. interval

B. ratio

C. nominal

D. ordinal

4. Consider the following scores: 0, 1, 1, 2, 4, 8. Which of the following would change more if a score of 30 were included in the set of scores?

A. mode

B. more than one of the above would change by the same amount

C. mean

D. median

5. You are in charge of hiring a new office manager at your company. In examining a set of personality test scores for the applicants, you notice that the most frequently occurring score is a 94. This number is referred to as the:

A. standard deviation

B. mode

C. median

D. mean