In Testing the Difference Between Two Population Means Using Two $X _ { 1 } - X _ { 2 }$

question 8

True/False

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 $X _ { 1 } - X _ { 2 }$
if the populations are normal with equal variances.

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