When initially extreme scores are followed by less extreme values (even when hypothesized), one wonders whether _____________ can account for the change.
A) maturation
B) selection
C) regression to the mean
D) testing

Question

Quizplus · Accepted Answer

Regression to the mean is a statistical phenomenon in which extreme scores tend to be followed by less extreme scores due to random fluctuations. This can happen regardless of any intervention or treatment, and may lead to false conclusions if not properly understood and accounted for. Maturation may also lead to changes over time, but it typically refers to developmental or natural processes rather than statistical ones. Selection refers to biases in sample selection, and testing refers to the effects of being tested on subsequent performance, neither of which would explain a regression effect.

When Initially Extreme Scores Are Followed by Less Extreme Values