which-of-the-following-is-not-an-assumption-required-for-a-valid-two-sample-t-te

Question

Which of the following is NOT an assumption required for a valid two-sample t-test with unknown and unequal variances?

Accepted Answer

The two samples must have equal population variances.

Answer

The samples should be randomly selected.

Answer

The samples must be independent.

Answer

The data should be approximately normally distributed or the sample sizes should be large.