When calculating the standard error of ₁ - ₂, under what assumption do you pool the sample variances and ? A) Known population variances. B) Unknown population variances that are assumed equal. C) Unknown population variances that are assumed unequal. D) All of these choices are correct.

Question

Quizplus · Accepted Answer

When pooling sample variances, we assume that the population variances are equal but unknown. This is known as the assumption of equal variances. Option A is incorrect because if we knew the population variances, there would be no need to calculate sample variances or standard error. Option C is incorrect because if the population variances were assumed to be unequal, we would not pool the variances. Option D is incorrect because not all choices are correct, only option B is correct.

When Calculating the Standard Error of 1 -

When Calculating the Standard Error of ₁ -