A study of a drug to prevent hair loss showed that 86% of the men who took it maintained or increased the amount of hair on their heads. But so did 42% of the men in the same study who took a placebo instead of the drug. This is an example of

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This is an example of the placebo effect, where the men who took the placebo saw an improvement in their hair growth even though they didn't take an actual drug. It is a commonly observed phenomenon in medical studies and highlights the importance of using control groups in experiments to isolate the effects of the independent variable.

A Study of a Drug to Prevent Hair Loss Showed