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Give a 90% confidence interval, for μ 1 − μ 2 given the following information. n...

Give a 90% confidence interval, for μ 1 − μ 2 given the following information. n 1 = 30 , ¯ x 1 = 2.38 , s 1 = 0.58 n 2 = 40 , ¯ x 2 = 2.87 , s 2 = 0.91 ±

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