For question 15, the value of t a/2 is 2.4 (based on the answer key). How do you

Question

For question 15, the value of t a/2 is 2.4 (based on the answer key). How do you arrive at that value?
15. Garlic for Reducing Cholesterol In a test of the effectiveness of garlic for lowering cholesterol, 49 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) had a mean of 0.4 and a standard deviation of 21.0 (based on data from "Effect of Raw Garlic vs Commercial Garlic Supplements on Plasma Lipid Concentrations in Adults with Moderate Hypercholesterolemia," by Gardner et al., Archives of Internal Medicine, Vol. 167). Construct a 98% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDL cholesterol? he effectiveness of

Explanation / Answer

Degree of freedom is n-1, here n= 49

Thus degree of freedom is 48

From the table, for DF = 48 and alpha = 0.02

t = 2.4

Yes, confidence interval contains 0 because some individuals have negative value and others have positive, there is a good chance that mean can be around or equal to zero.

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