Using a pretest-posttest, nonequivalent control group design, Professor Moriarty takes a group of subjects who received the lowest scores on the pretest and, one day later, runs them through a program that
He believes, will help the subjects improve their scores. One week later, when the study is finished, Professor Moriarty finds that, indeed, the scores have improved with these subjects. What type of confound does he need to consider in this case?
a. Maturation
b. Interviewer bias
c. Regression to the mean
d. Experimenter bias
c
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The statistic that is used to depict the relationship between two variables that has been uncovered in a correlational study is called the correlational ____
a. multiplicand b. deviation c. permutation d. coefficient
How has life expectancy changed the landscape of retirement since the 1930s?
a. People are not as healthy after retirement. b. People tend to forego retirement. c. People are living longer after retirement. d. People receive unrestricted benefits from the government.