A drug and a placebo are compared for treating diabetes. A random half of the subjects receive the drug, while the other half receives the placebo. Blood glucose level is tested in all of the subjects several times a day. What type of design does this study represent?
A) Single-factor within-subjects
B) Single-factor between subjects
C) One-group pretest-posttest
D) Posttest-only design with nonequivalent control groups

Question

Quizplus · Accepted Answer

This study represents a single-factor between-subjects design, because the subjects are randomly assigned to one of two groups (drug or placebo), and the blood glucose level is measured repeatedly in all subjects, but the treatment is only given to one group.

A Drug and a Placebo Are Compared for Treating Diabetes