If You Wish to Estimate with 95% Confidence the Average

Multiple Choice

If you wish to estimate with 95% confidence the average number of miles that students living off-campus commute to classes every day, a random sample of 20 students produced a mean equal to 5.2 miles and a standard deviation of 3.05 miles. Then, the upper limit for a 95% confidence interval estimate for the true population mean is approximately:

A) 3.22
B) 6.63
C) 5.20
D) 2.15
E) 1.96