When used in the analysis of a pretest-posttest design, the ANCOVA:
A) Changes a mixed design to a single-factor design
B) Uses differences in pretest scores to adjust the posttest scores
C) Analyzes only the posttest scores after adjustments have been made with the pretest scores
D) All of the above

Question

Quizplus · Accepted Answer

ANCOVA (Analysis of Covariance) in a pretest-posttest design adjusts posttest scores based on pretest scores, effectively controlling for initial differences and allowing for the analysis of adjusted posttest scores as if they were from a single-factor design. This means all the options provided are correct actions or effects of using ANCOVA in this context.

When Used in the Analysis of a Pretest-Posttest Design, the ANCOVA