A Null Hypothesis Is That the Mean Cholesterol Level Is

Multiple Choice

A null hypothesis is that the mean cholesterol level is 200 in a certain age group. The alternative is that the mean is not 200. Which of the following is the most significant evidence against the null and in favor of the alternative?

A) For a sample of n = 25, the sample mean is 220.
B) For a sample of n = 10, the sample mean is 220.
C) For a sample of n = 50, the sample mean is 180.
D) For a sample of n = 20, the sample mean is 180.