A nutritionist wants to conduct a study to determine the efficacy of eating beans as an aid in weight loss. She randomly assigns half of a group of overweight persons to a treatment group who are given a planned diet which includes a variety of beans at two meals each day for six weeks. The other half of the group is given the same diet without the beans. Both diets are designed to have the same caloric content. A nurse at the nutrition center weighs each
Subject on Friday of each week. Select the potential source of confounding (if any).
A) Experimenter effect
B) Placebo effect
C) Method of assignment to treatment and control groups
D) The study is essentially free of confounding sources.

Question

Quizplus · Accepted Answer

The study is essentially free of confounding sources because the subjects are randomly assigned to treatment and control groups, and the diets are designed to have the same caloric content.

A Nutritionist Wants to Conduct a Study to Determine the Efficacy