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

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:

Select one:

populations are normally distributed.

sample sizes are both large.

populations have equal variances.

populations are normal with equal variances.

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