Question: In testing the difference between two population means using two independent samples, you use the pooled variance in estimating the standard error of the sampling

In testing the difference between two population means using two independent samples, you use the

pooled variance in estimating the standard error of the sampling distribution of the sample mean difference

x1 - x2 if the

A. populations are normal.

B. populations are at least normally distributed with equal variances.

C. sample sizes are both large.

D. populations are nonnormal with unequal variances.

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