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 if the populations are normal with equal variances.

Question

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  if the populations are normal with equal variances.

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When the populations are normal with equal variances, we use the pooled variance to estimate the standard error of the sampling distribution of the sample mean difference in testing the difference between two population means using two independent samples.

In Testing the Difference Between Two Population Means Using Two