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Let X1, . . . ,Xn be a sample from an N (was?) distribution and Y1, . . . , Ym be an independent sample

Let X1, . . . ,Xn be a sample from an N (was?) distribution and Y1, . . . , Ym be an independent sample from an N (p.37, 02) distribution. Let X and l7 he the respective sample means, and Si: and S)\

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