In an application to estimate the mean number of miles that downtown employees commute to work roundtrip each day, the following information is...

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

x = 4.33

s= 3.50

Based on the information, the upper limit for a 95% confidence interval estimate for the true population mean is:

a) Nearly 12.0 miles

b) about 5.86 miles

c) About 5.97 miles

d) about 7.83 miles