An independent t-test is used to test for: Question 8 options: Differences between means of groups containing the same entities when the sampling distribution is not normally distributed and the data do not have unequal variances. Differences between means of groups containing different entities when the sampling distribution is normal, the groups have equal variances and data are at least interval. Differences between means of groups containing different entities when the data are not normally distributed or have unequal variances. Differences between means of groups containing the same entities when the data are normally distributed, have equal variances and data are at least interval.