Both over-the-counter niacin and the prescription drug Lipitor are known to lower blood cholesterol levels. In one double-blind study Lipitor outperformed niacin. The 95% confidence interval estimate of the difference in mean cholesterol level lowering was (18, 41). Which of the following is a reasonable conclusion?
(A)Niacin lowers cholesterol an average of 18 points, while Lipitor lowers cholesterol an average of 41 points. (B)There is a 0.95 probability that Lipitor will outperform niacin in lowering the cholesterol level of any given individual. (C)There is a 0.95 probability that Lipitor will outperform niacin by at least 23 points in lowering the cholesterol level of any given individual. (D)None of the above.
D