Chapter 13, Problem 45P

Use the following information to answer the next five exercises. Two coworkers commute from the same building. They are

interested in whether or not there is any variation in the time it takes them to drive to work. They each record their times for

20 commutes. The first worker’s times have a variance of 12.1. The second worker’s times have a variance of 16.9. The first

worker thinks that he is more consistent with his commute times. Test the claim at the 10% level. Assume that commute

times are normally distributed.

State the null and alternative hypotheses.