Why should you use a repeated measures t test in this research situation? There are two sample means, both coming from the same group of people, that is measured twice under different conditions. There are three sample means, each coming from three different groups of people. There is one sample mean and one population mean being compared. In this study, the same participants are measured twice and so the same people are in both conditions. Why doesn't this violate the assumption of independence? The assumption is that there is independence within conditions, not between conditions. The assumption of independence is not important for a repeated measures design. In this study, results in either direction would have theoretical implications for the population and so a two-tailed test is more appropriate. Which of the following is the symbolic representation of the statistical null hypothesis? D = 0. D 0