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Assume that the medical scores of a drug follow normal model with an unknown mean and...

Assume that the medical scores of a drug follow normal model with an unknown mean and a variance of 2. If a clinical trial needs to control the type I error at 0.05 and the type II error at 0.10 for testing the unknown mean score equals 2 versus 4, at least how many patients should be recruited in the study.

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