Studies have suggested that compounds in broccoli might combat the effects of overexposure to ultraviolet radiation. We conduct an experiment to determine whether a cream consisting of a broccoli extract reduces sunburn pain. Sixty patients suffering from pain from severe sunburn are available. What is a good way to conduct the experiment?
(A) Give the cream to all 60 patients, and record their responses.
(B) Allow the patients to choose either the cream or an over-the-counter alternative, and record the responses.
(C) Divide the patients randomly into three groups of 20 patients each. Give one group the cream, another group an over-the-counter sunburn relief product, and the last group a placebo. Record the responses.
(D) Give some patients the cream and others the placebo, being sure to inform the patients which treatment they are receiving. Record the responses.
Answer: (C) Divide the patients randomly into three groups of 20 patients each. Give one group the cream, another group an over-the-counter sunburn relief product, and the last group a placebo. Record the responses.
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