The posttest-only control group design generally is preferred over the pretest-posttest control group design because the latter is susceptible to the effects of
A) differential attrition.
B) history.
C) statistical regression.
D) selection-X interaction.
E) testing-X interaction.

Question

Quizplus · Accepted Answer

The pretest-posttest design can be affected by testing-X interaction, where the pretest influences the participants' responses to the treatment, thus affecting the internal validity of the study.

The Posttest-Only Control Group Design Generally Is Preferred Over the Pretest-Posttest