Most drivers know that the average annual repair expense for a car is

automobile depends on the age of the vehicle. An investigator wants to know if the variance

of the annual expenses that are applied in repair also increases with the age of the

vehicle. In a sample of 31 4-year-old cars, the standard deviation

sample for annual repair expenses was $ 170, and in a sample of 25

2-year-old automobiles was $ 100. Perform a hypothesis test to

show that the annual repair costs are higher the older the

cars with a significance level of a) 5% and b) 1!