In a pretest-posttest design, regression is an unlikely explanation for the results if
A) your measurements are completely free of random error.
B) subjects' scores on the pretest were not extreme
C) subjects' scores on the posttest were more extreme than their pretest scores
D) all of the above

Question

Quizplus · Accepted Answer

Regression to the mean is less likely if measurements are free of random error, pretest scores are not extreme, and posttest scores are more extreme than pretest scores.

In a Pretest-Posttest Design, Regression Is an Unlikely Explanation for the Results