Question: Let 1 and 2 denote true average tread lives for two competing brands of size P205/65R15 radial tires. (a) Test H 0 : 1 =

Let 1 and 2 denote true average tread lives for two competing brands of size P205/65R15 radial tires.

(a) Test

H0: 1 = 2

Ha: 1 = = 2

at level 0.05 using the following data: m = 45, x = 42500, s1 = 2200, n = 45, y = 40400 , and s2 = 1900.

(b) Construct a 95% CI for 1 2.

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