A researcher wants to investigate the effectiveness of a cholesterol-lowering medication.The 450 participants are first divided into two groups - those suffering from diabetes and those not suffering from diabetes.Within each group the participants are randomly assigned to one of three groups.The first group will receive a low dose of the medication,the second group will receive a high dose of the medication,and the third group will receive a placebo.At the end of a six-month period,each person's cholesterol will be tested and the change in their cholesterol level will be recorded.
A)Completely randomized over two factors,medication and diabetes
B)Randomized block design,blocking on cholesterol level,with two factors,medication and diabetes
C)Randomized block design,blocking on diabetes,with one factor,medication
D)Randomized block design,blocking on medication,with one factor,diabetes
E)None of the above

Question

Quizplus · Accepted Answer

The correct design is a randomized block design where the participants are first blocked into groups based on whether they have diabetes or not, and then within each block, they are randomly assigned to different levels of a single factor, which is the medication dosage (low, high, or placebo).

A Researcher Wants to Investigate the Effectiveness of a Cholesterol-Lowering