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10. In a study to investigate the effect of diet on reducing cholesterol levels, a random...

10. In a study to investigate the effect of diet on reducing cholesterol levels, a random sample 15

subjects known to have high cholesterol had their cholesterol measured at the beginning of the study and again after 6 months on a special diet. The results are below. Suppose that you could assume that the differences in cholesterol are a simple random sample from normal population. d = 8 and so = 16 [d=before - after]

a) Perform the test if the special diet is effective at reducing cholesterol levels at 5%

significance level using P-value method.

b) Find a 90% confidence interval for the mean difference.

Math   Statistics-And-Probability   
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