How many people would need to be studied to have 80% power under the assumptions in Problem
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How many people would need to be studied to have 80% power under the assumptions in Problem 7.9?
Diabetes
Plasma-glucose levels are used to determine the presence of diabetes. Suppose the mean ln (plasma-glucose) concentration (mg/dL) in 35- to 44-year-olds is 4.86 with standard deviation = 0.54. A study of 100 sedentary people in this age group is planned to test whether they have a higher or lower level of plasma glucose than the general population.
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