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The Sampling Distribution Of xˉ1−xˉ2\bar { x } _ { 1 } - \bar { x } _ { 2 }

Question 138

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The sampling distribution of xˉ1−xˉ2\bar { x } _ { 1 } - \bar { x } _ { 2 } is normal if the sampled populations are normal, and approximately normal if the populations are nonnormal and the sample sizes n1 and n2 are large.

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