Problem 8.34 To determine the difference, if any, between two brands of radial tires, 12 tires of each brand were tested and the following mean lifetimes and sample standard deviations for the two brands were obtained: x1 = 38500 and s1 = 3100; x2 = 41000 and s2 = 3500. Assuming that the tire lifetimes are normally distributed with identical variances, test the hypothesis that there is no difference between the two lifetimes. Compute the P-value of your test.