Question

In a test of the effectiveness of garlic for lowering​ cholesterol, 44 subjects 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 a mean of 3.5 and a standard deviation of 19.7. Complete parts​ (a) and​ (b) below. a. What is the best point estimate of the population mean net change in LDL cholesterol after the garlic​ treatment? The best point estimate is nothing ​mg/dL. ​(Type an integer or a​ decimal.) b. 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? What is the confidence interval estimate of the population mean mu​? ____ ​mg/dL less than mu less than _____mg/dL What does the confidence interval suggest about the effectiveness of the​ treatment? A. The confidence interval limits contain ​0, suggesting that the garlic treatment did not affect the LDL cholesterol levels. B. The confidence interval limits contain ​0, suggesting that the garlic treatment did affect the LDL cholesterol levels. C. The confidence interval limits do not contain ​0, suggesting that the garlic treatment did not affect the LDL cholesterol levels. D. The confidence interval limits do not contain ​0, suggesting that the garlic treatment did affect the LDL cholesterol levels.

Answer 1

a)

best point estimate of the population mean net change in LDL cholesterol after the garlic​ treatment =3.5

b)

95​% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment =-2.490 < <9.490

A. The confidence interval limits contain ​0, suggesting that the garlic treatment did not affect the LDL cholesterol levels.