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A researcher is measuring the effectiveness of a medication they have developed, which they believe to reduce headaches. As part of the study, 100 participants

A researcher is measuring the effectiveness of a medication they have developed, which they believe to reduce headaches. As part of the study, 100 participants are recruited from a clinic in NYC, of which 50 are given the medication and 50 are given a placebo and asked to report whether there has been any change in their headaches using a questionnaire.

What is the population in this study?

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