A medical researcher wanted to test the impact of four different pain-relief drugs ('Placebo', 'Drug X', 'Drug Z' and 'Drug Y') on a group of twenty randomly selected patients with a long-term chronic illness. He wanted to compare the impact of each drug on each individual patient's rating of pain and across the group of patients, as well as any interaction effects. What sort of test design best suits this study?

Question

Quizplus · Accepted Answer

A repeated-measures factorial design would be the best choice for this study, as it allows for comparison of the effects of each drug on the same group of patients over time. This design also allows for the examination of any interaction effects between the drugs and the patients. In this case, the repeated measures would be the pain ratings of each patient taken before and after each drug treatment.

A Medical Researcher Wanted to Test the Impact of Four