a. Use the data of Example 9.4 to compute a 95% CI for μ1 – μ2. Does the resulting interval suggest that μ1 – μ2 has been precisely estimated?
b. Use the data of Exercise 3 to compute a 95% upper confidence bound for μ1 – μ2
Reference Exercise 3
Let μ1 denote true average tread life for a premium brand of P205/65R15 radial tire, and let μ2 denote the true average tread life for an economy brand of the same size. Test
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