Let mu1 denote true average tread life for a premium brand o

Let mu_1 denote true average tread life for a premium brand of P205/65R15 radial tire, and let mu_2 denote the true average tread life for an economy brand of the same size. Test H_0. mu_1 - mu_2 = 5000 versus H_a: mu_1 - mu_2 > 5000 at level 0.01, using the following data: m = 40, x = 42,100, s_1 = 2200, n = 40, y = 36,500, and s_2 = 1800. Calculate the test statistic and determine the P-value. (Round your test statistic to two decimal places and your P-value to four decimal places.) z = P-value =

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