A Nutritionist Wants to Conduct a Study to Validate the Efficacy

question 65

Multiple Choice

A nutritionist wants to conduct a study to validate the efficacy of an herb as an aid in weight loss. She randomly assigns half of a group of overweight persons to a treatment group who are given the herb with instructions for its use and a planned diet for six weeks. The other half of the group is given the same diet without the herb. A nurse at the nutrition center weighs each subject on Friday of each week. Select the potential source of confounding.

• A) The placebo effect
• B) Method of assignment to treatment and control groups
• C) Experimenter effect
• D) The study is essentially free of confounding sources.

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