Question: Testing the difference between two population means using two independent samples, the sampling distribution of the sample mean difference x 1 - x 2 is

Testing the difference between two population means using two independent samples, the sampling distribution of the sample mean difference x₁ - x₂ is normal if the

A. sizes are both greater than 30.

B. populations are nonnormal with unequal variances.

C. populations are normal.

D. populations are at least normally distributed with equal variances

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