When testing a hypothesis concerning the difference of two independent population means, if the variance of the difference is estimated using the sample variances, the resulting test statistic has a Normal distribution.

Question

Quizplus · Accepted Answer

When estimating the variance of the difference between two independent population means using sample variances, the resulting test statistic follows a t-distribution, not a Normal distribution, especially when the population variances are unknown and assumed to be unequal.

When Testing a Hypothesis Concerning the Difference of Two Independent