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A researcher finds 1000 mildly overweight women who exercise regularly, have not had a heart attack, and are willing to participate in the study. she randomly assigns 500 of the women to take an appetite suppressant. the other 500 women are given a placebo. both groups are followed for five years and the amount of weight lost after this time is recorded. the factor (explanatory variable) in the experiment is

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meerkat18
The treatment taken by women in the study — appetite is the factor (explanatory variable) in the experiment. So we can say that the factor (explanatory variable) in the experiment is the treatment taken by women in the study — appetite. The answer in this question is the amount of weight lost.