A variable has a standard deviation of 40 mg/dL. We want to test a mean difference in two groups wit


Question: A variable has a standard deviation of 40 mg/dL. We want to test a mean difference in two groups with α = 0.05 (two sided) and power 84%.

a. How many observations are needed to detect a difference of 10 mg/dL?

b. Suppose we can recruit only 230 subjects into group 1. How many individuals do we need in group 2?

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