Suppose the Goodyear Tire Company developed two new brands of tires and would like to compare the variability of the tire life of the two. Both brands were driven under normal conditions, and random samples of the tires were collected. The following table shows the sample sizes and the standard deviations, in miles, calculated for each sample:

Brand 1 Brand 2 Sample standard deviation 5,300 miles 3,500 miles Sample size 20 20

a. Using a = 0.10, determine if there is a difference in the variability of the two tire brands.

b. Verify your results using PHStat.

c. Interpret the p-value obtained from the software.

AppendixLO1