Problem 5. Two companies manufacture a rubber material intended for use in an automotive application. The part will be subjected to abrasive wear in the field application, so we decide to compare the material produced by each company in a test. Twenty-five samples of material from each company are tested in an abrasion test, and the amount of wear after 1000 cycles is observed. For company 1, the sample mean x1 = 23 and standard deviation of wear are milligrams/1000 cycles and si = 2 milligrams/1000 cycles, while for company 2 we obtain x2 = 15 milligrams/1000 cycles and s2 = 8 milligrams/ 1000 cycles. test the hypothesis H0 calculate t0