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.Identify the treatments.
A)Medication (3 levels),change in cholesterol
B)Placebo,low dose of medication,high dose of medication (3 levels)
C)Medication (3 levels),diabetes (2 levels)
D)Placebo and diabetes,low dose of medication and diabetes,high dose of medication and diabetes,placebo and no diabetes,low dose of medication and no diabetes,high dose of medication and no diabetes (6 levels)
E)Medication (3 levels),blocking variable - diabetes (2 levels)

Question

Quizplus · Accepted Answer

The treatments in this study are the placebo, low dose of medication, and high dose of medication. These are the interventions being directly manipulated to observe their effect on cholesterol levels.

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