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Social Studies, 23.09.2019 23:00 giselabarajas24
You conduct a clinical trial to test whether a new drug relieves the symptoms of arthritis better than a placebo. you have four groups of participants, all of whom have moderately painful arthritis (rated 7 on a scale of 1 to 10). each group receives a daily pill as follows: group 1-placebo; group 2-15 mg; group 3-25 mg; group 4-50 mg. at the end of 2 weeks, participants in each group are asked to rate their pain on a scale of 1 to 10.what is the independent variable in this experiment?
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