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Social Studies, 22.07.2019 06:30 grace783

Dr. cooke wanted to know if a drug was more effective than a placebo. she gave one group the real drug and measured its effectiveness, and gave the other group the placebo and measured its effectiveness. dr. cooke is doing a(n):

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Dr. cooke wanted to know if a drug was more effective than a placebo. she gave one group the real dr...
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