Ten subjects with borderline-high cholesterol levels were randomly recruited for a study that involved taking a nutrition education class. Cholesterol readings were taken before the class and 3 months after the class.

Let d = preclass cholesterol - postclass cholesterol. Excel was used to find the 95% confidence interval for the mean amount of reduction in cholesterol readings after taking the nutrition education class. Verify the results shown on the output by calculating the values yourself. Assume normality.

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Subject 1 2 3 4 5 6 7 8 9 10 Preclass 295 279 250 235 255 290 310 260 275 240 Postlass 265 266 245 240 230 230 235 250 250 215 卜Estimate: Mean Mean Standard deviation LCL UCI dpre post 26Pos 24.4997 8.773924024 43.82607598