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Population 1 / Population 2 1 = 12 1 2 = 10 Of = 4 OR = 3 Independent random sample of 64 observation each

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Population 1 / Population 2 1 = 12 1 2 = 10 Of = 4 OR = 3 Independent random sample of 64 observation each are chosen from two normal populations with the mean and standard deviation shown. Assume that x, and X, denote the two sample means. What is the standard deviation of the sampling distributionx, ? willis A . LIZS + B . 375 C . 565 D . 5 +

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