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Plasma-glucose levels are used to determine the presence of diabetes. Suppose the mean in (plasma glucose) concentration (mg/dL) in 35-44 year olds is 4.86 with standard deviation 0.54. A study of 100 sedentary people in this age group is planned to test if they have a higher or lower level of plasma glucose than the general population. A. If the expected difference is 0.10 in units, then what is the power of such a study if a two-sided test is to be used with α = .05? B. Answer the previous question if the expected difference is 0.20 in units. C. How many people would need to be studied to have 80% power under the assumptions in problem A?

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