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In Testing the Difference Between Two Population Means Using Two xˉ1−xˉ2\bar { x } _ { 1 } - \bar { x } _ { 2 }

Question 136

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In testing the difference between two population means using two independent samples, the sampling distribution of the sample mean difference xˉ1−xˉ2\bar { x } _ { 1 } - \bar { x } _ { 2 } is normal if the sample sizes are both greater than 30.

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