Within-subjects designs are always preferable over between-subjects designs.

Question

Quizplus · Accepted Answer

Within-subjects designs have advantages, such as requiring fewer participants and controlling for individual differences, but they are not always preferable because they can introduce carryover effects and are not suitable for all types of research questions. Between-subjects designs eliminate carryover effects and are better for studying effects that cannot be reversed or when the same participants cannot be used for all conditions.

Within-Subjects Designs Are Always Preferable Over Between-Subjects Designs