Question: [8. In testing the difference between two population means using two independent samples, we use the Jooled variance in estimating the standard error of the

[8. In testing the difference between two population means using two independent samples, we use the Jooled variance in estimating the standard error of the sampling distribution of the sample mean difference 51 x'2 if the &. populations are at least normally distributed with equal variances. 3. populations are nonnormal with unequal variances. 3. sizes are both greater than 30. D. ample sizes are both large

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