A Medical Researcher Wanted to Test the Impact of Four

Multiple Choice

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?

A) Independent factorial design
B) ANOVA
C) Repeated-measures factorial design
D) Multiple linear regression.