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4. Construct the confidence interval for μ 1 − μ 2 for the level of confidence...

4. Construct the confidence interval for μ 1 − μ 2 for the level of confidence and the data from independent samples given. 99.5% confidence: n 1 = 40, x - 1 = 85.6, s 1 = 2.8 n 2 = 20, x - 2 = 73.1, s 2 = 2.1 99.9% confidence: n 1 = 25, x - 1 = 215, s 1 = 7 n 2 = 35, x - 2 = 185, s 2 = 12

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