To Estimate with 95% Confidence the Average Number of Kilometres

Multiple Choice

To estimate with 95% confidence the average number of kilometres that students living off-campus commute to classes every day, a random sample of 20 students was taken and produced a mean equal to 5.2 km and a standard deviation of 3.05 km. Under these circumstances, what is the appropriate critical value?

A) 1.7291
B) 1.96
C) 2.086
D) 2.093