Let μ1 denote true average tread life for a premium brand of
P205/65R15 radial tire, and let μ2 denote the true average tread
life for an economy brand of the same size. Test H0: μ1 − μ2 = 5000
versus Ha: μ1 − μ2 > 5000 at level 0.01, using the following
data: m = 35, x = 42,100, s1 = 2500, n = 35, y = 36,900, and s2 =
1500. Calculate the test statistic and determine the P-value....