a test of the effectiveness of garlic for lowering​ cholesterol, 41 senior citizens were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol​ (in mg/dL) have an average​ (mean) of 3.8. Identify the​ sample, the​ population, the sample​ statistic, and the population parameter in th

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