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Population, Sample, Statistic, and Parameter. Exercises 11–14 each describe a statistical study. In each case, identify the sample, the population, the sample statistic, and the population parameter.
13. Garlic and Cholesterol. In a test of the effectiveness of garlic for lowering cholesterol, 47 adult subjects were treated with Garlicin, which is garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in the subjects’ levels of LDL cholesterol (in mg/dL) had an average (mean) of 3.2 (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).
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