The National Institutes of Health is at last sponsoring proper clinical trials of some natural remedies. In one study at Duke University, 330 patients with mild depression are enrolled in a trial to compare Saint-John's-wort with a placebo and with Zoloft, a common prescription drug for depression. The Beck Depression Inventory is a common instrument that rates the severity of depression on a 0 to 3 scale.
Identify the completely randomized clinical trial for this study.
A.
Create pairs of similar subjects and randomly assign one of the treatments to each subject in a group.
B.
Create groups of subjects in increasing order of the severity of depression and assign subjects randomly to each treatment within each group.
C.
Randomly divide subjects into three groups, each consisting of 110 subjects. Assign each group to one of the treatments. Observe change in Beck Inventory score.
Answer: C.
Randomly divide subjects into three groups, each consisting of 110 subjects. Assign each group to one of the treatments. Observe change in Beck Inventory score.
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.