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

Question 144

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In testing the difference between two population means using two independent samples, we use the pooled variance in estimating the standard error of the sampling distribution of the sample mean difference xˉ1−xˉ2\bar { x } _ { 1 } - \bar { x } _ { 2 } if the populations are normal with equal variances.

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