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The number of miles of useful tread wear {in 10005) was determined for tires of each of fIve different makes of subcom pact car (factor A, with l = 5} in combination with each of four different brands of radial tires (factor B, with J = 4), resulting in U = 20 observations. The values SSA = 30.2, 583 = 44.7, and SSE = 59.1 were then computed. To test whether there is no differences in true average tire lifetime due to makes of cars or not, obtain the test statistic