In an Application to Estimate the Mean Number of Miles

Multiple Choice

In an application to estimate the mean number of miles that downtown employees commute to work roundtrip each day,the following information is given: n = 20 = 4.33
S = 3.50
Based on this information,the upper limit for a 95 percent confidence interval estimate for the true population mean is:

A) about 5.97 miles.
B) about 7.83 miles.
C) nearly 12.0 miles.
D) about 5.86 miles.