The number of miles of useful tread wear (in 1000s) was
Chapter 11, Problem 11.1(choose chapter or problem)
The number of miles of useful tread wear (in 1000s) was determined for tires of each of five different makes of subcompact car (factor A, with I 5) in combination with each of four different brands of radial tires (factor B, with J 4), resulting in IJ 20 observations. The values SSA 30.6, SSB 44.1, and SSE 59.2 were then computed. Assume that an additive model is appropriate. a. Test H0: 1 2 3 4 5 0 (no differences in true average tire lifetime due to makes of cars) versus Ha: at least one i 0 using a level .05 test. b. H0: 1 2 3 4 0 (no differences in true average tire lifetime due to brands of tires) versus Ha: at least one j 0 using a level .05 test.
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