Which type of confounding may occur in cases with extreme poverty or extremely high-risk behavior, as pre-posttest scores may end up showing improvement only because they cannot get worse?
A) Selection bias
B) Attrition confound
C) Diffusion of treatment
D) Regression to the mean

Question

Quizplus · Accepted Answer

Regression to the mean occurs when extreme scores on a pre-test naturally move closer to the average on a post-test, not due to any intervention but because of statistical tendency.

Which Type of Confounding May Occur in Cases with Extreme