Statistical regression occurs when
A) taking a pretest affects scores on the posttest independently of the effect of the independent variable.
B) the measure used to assess the dependent variable changes over time.
C) research participants who obtained extreme scores on a pretest have posttest scores that are closer to the mean.
D) participants' scores on a measure change over time as a result of natural aging processes.

Question

Quizplus · Accepted Answer

Statistical regression occurs when extreme scores on a pretest become less extreme on a posttest, simply due to the fact that extreme scores are more likely to be caused by measurement error or other temporary factors rather than a stable trait or characteristic. This can lead to the illusion of an intervention having a positive effect when in fact, it is just the regression toward the mean.

Statistical Regression Occurs When