A Study Was Recently Conducted to Estimate the Mean Cholesterol

Multiple Choice

A study was recently conducted to estimate the mean cholesterol for adult males over the age of 55 years. From a random sample of n = 10 men, the sample mean was found to be 242.6 and the sample standard deviation was 73.33. To find the 95 percent confidence interval estimate for the mean, the correct critical value to use is:

A) 1.96
B) 2.2281
C) 2.33
D) 2.2622