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
If the desired confidence level is 95 percent,the appropriate critical value is:

A) z = 1.96
B) t = 2.093
C) t = 2.086
D) .7826