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.
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.
C.
Give some patients the cream and others the placebo, being sure to inform the patients which treatment they are receiving. Record the responses.
Answer: B.
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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