10.17 [EX10-017] Ten subjects with borderlinehigh cholesterol levels were randomly recruited for a study. The study involved taking a nutrition education class. Cholesterol readings were taken before the class and 3 months after the class.

Subject 1 2 3 4 5 6 7 8 9 10 Preclass 295 279 250 235 255 290 310 260 275 240 Postclass 265 266 245 240 230 230 235 250 250 215 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.

t-Estimate: Mean d  pre  post Mean 26.3 Standard deviation 24.4997 LCL 8.773924024 UCL 43.82607598