Constructing a Confidence Interval: Garlic for Reducing Cholesterol A common claim is that garlic…

Constructing a Confidence Interval: Garlic for ReducingCholesterol A common claim is that garlic lowers cholesterol levels. In a test of the effectiveness of garlic, 49 subjects were treated with doses of raw garlic, and their cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg dL) have 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). Use the sample statistics of n = 49,  = 0.4, and s = 21.0 to construct a 95% 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?

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