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Diabetes,,7.9,Plasma-glucose levels are used to determine the presence of diabetes. Suppose the mean in (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. ,7.7If 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 a=.05,,7.9) How many people would need to be studied to have 80% power under the assumption in Problem 7.7?,

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