The Manager of the Service Department of a Local Car

Multiple Choice

The manager of the service department of a local car dealership has noted that the service times of a sample of 16 new automobiles has a standard deviation of 5 minutes. A 95% confidence interval estimate for the variance of service times for all their new automobiles is

A) 13.642 to 59.885.
B) 9.46 to 34.09.
C) 2.144 to 9.948.
D) 2.728 to 11.977.