Regression toward the mean refers to the fact that:
A)extreme scores tend to change toward the less extreme mean.
B)statistical regression results from changes that occur systematically over time.
C)participants should be selected based on extreme scores taken at one time.
D)mean scores of pretest and posttest measures will be the same after manipulation.

Question

Quizplus · Accepted Answer

Regression toward the mean refers to the phenomenon where extreme scores on a variable tend to move or regress towards the average or mean score upon retesting. This is due to the fact that extreme scores are likely to be caused by random, unrepresentative factors that are unlikely to persist upon retesting. For example, if a group of students who score very high on a test one year are retested the next year, their scores are likely to regress toward the mean.

Regression Toward the Mean Refers to the Fact That