3. Let m1 denote true average tread life for a premium brand of P205/65R15 radial tire and...

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3. Let m1 denote true average tread life for a premium brand of P205/65R15 radial tire and let m2 denote the true average tread life for an economy brand of the same size. Test H0: m1  m2  5000 versus Ha:

m1  m2 5000 at level .01 using the following data: m  45, , s1  2200, n  45,

, and s2  1500.

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