Which of the following is an assumption for the two-independent sample t test,but not the one-sample t test?
A)Normality
B)Random sampling
C)Independence
D)Equal variances

Question

Quizplus · Accepted Answer

The assumption of equal variances is only required for the two-independent sample t test and not for the one-sample t test. This is because in the two-sample test, we are comparing means between two independent groups, and the variance of the two groups may not be the same. However, in the one-sample test, we are comparing the sample mean to a known or hypothesized population mean, and there is only one sample variance involved. Normality, random sampling, and independence are assumptions for both one-sample and two-independent sample t tests.

Which of the Following Is an Assumption for the Two-Independent