2. Let m1 and m2 denote true average tread lives for two competing brands of size P205/65R15...

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2. Let m1 and m2 denote true average tread lives for two competing brands of size P205/65R15 radial tires.

Test H0: m1m20 versus Ha: m1m20 at level

.05 using the following data: m 45, , s1 2200, n 45, , and s2 1900.

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