Professor Johns is performing an experiment to test hypnosis as a treatment for smoking. He is trying to decide which type of experimental design will be appropriate for the study. Which would you suggest?
A) He should use a non-experimental design
B) He should use a within-subjects design
C) He should use a between-subjects design, so that each subject can act as their own control
D) He should use a between-subjects design because of carryover effects

Question

Quizplus · Accepted Answer

A between-subjects design is appropriate for this study to avoid carryover effects, which could occur if the same subjects were exposed to both the treatment and control conditions (as in a within-subjects design). Carryover effects could confound the results, making it difficult to determine if changes in smoking behavior were due to the hypnosis or to the residual effects of being in both conditions.

Professor Johns Is Performing an Experiment to Test Hypnosis as a Treatment