Question #2 A consumer research firm wants to compare three brands of (Goodyear, Yokohama, and Michelin) in terms of tread life over diffe road surfaces. Random samples of four tires of each brand are selected each of three surfaces (asphalt, concrete, gravel). A machine that simulate road conditions for each of the road surfaces is used to find read life (in thousands of miles) of each tire. Construct a table conduct tests for the presence of nonzero brand effects, road sur effects, and interaction effects. Goodyear Yokohama Michelin Asphalt 36 39 38 39 Concrete 38 40 40 41 Gravel 34 32 34 35 42 40 39 42 42 45 48 47 34 34 30 31 32 36 35 34 37 33 33 34 36 35 w55 35 33

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