Most people are aware of the fact that the average annual repair cost for a car depends on the age of the car. A researcher wants to study the difference in the variances of the annual repair costs for newer and older cars. In a sample of 47 old (more than four years old) cars, the standard deviation for the annual repair costs is $130. In a sample of 32 new (less than two years old) cars, the standard deviation for the annual repair costs is $70.

Construct a 99% confidence interval to estimate the ratio of the variances in the annual repair costs between old and new cars.

Note: let the old cars be population 1 and the new cars be population 2.

• In blank #1, enter the upper limit for the confidence interval. (Round your answer to 4 decimal places and enter your answers as 0.1234 (not .1234).)
• In blank #2, enter the lower limit for the confidence interval. (Round your answer to 4 decimal places and enter your answers as 0.1234 (not .1234).)
• Is there evidence to suggest that the variance in the annual repair costs is larger for older cars? Enter "yes" or "no" in blank #3