Find the appropriate values of n1 and n2 (assume that n1 = n2 ) needed to estimate (μ1 – μ...

Find the appropriate values of n1 and n2 (assume that n1 = n2 ) needed to estimate (μ1 – μ2 )with

a. A sampling error equal to 3.2 with 95% confidence. From prior experience, it is known that σ1 ≈15 and σ2 ≈17.

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b. A sampling error equal to 8 with 99% confidence. The range of each population is 60.

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c. A 90% confidence interval of width 1.0. Assume that