A lack of original equivalency between two preexisting groups can be partly compensated for by using a pretest, posttest, and a/an
A) analysis of covariance.
B) analysis of variance.
C) factorial design.
D) randomization procedure.

Question

Quizplus · Accepted Answer

Analysis of covariance (ANCOVA) can help adjust for differences in preexisting groups by using the pretest scores as a covariate. This helps to increase the statistical power of the study and improve the accuracy of the results. ANCOVA can be used in conjunction with a pretest-posttest design to control for potential confounding variables and improve the internal validity of the study.

A Lack of Original Equivalency Between Two Preexisting Groups Can