# Question

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.

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

c. A 90% confidence interval of width 1.0. Assume that σ12 = 5.8 and σ22 = 7.5.

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

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

c. A 90% confidence interval of width 1.0. Assume that σ12 = 5.8 and σ22 = 7.5.

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