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A study gives a drug to 100 patients and a placebo to another 100 patients, but neither group knows which they received. After 6 weeks, the drug group improved significantly more. Which principle of experimental design BEST explains why we can conclude the drug is effective?
A study gives a drug to 100 patients and a placebo to another 100 patients, but neither group knows which they received. After 6 weeks, the drug group improved significantly more. Which principle of experimental design BEST explains why we can conclude the drug is effective?