Repeated-measures and matched-subjects experiments Repeated-measures experiments measure the same set of research participants two or more times, while matched-subjects experiments study participants who are matched on one or more characteristics. Which of the following are true for both a repeated-measures experiment and a matched-subjects experiment when used to compare two treatment conditions? Check all that apply. a. The researcher computes difference scores to compute a t statistic. b. The researcher must compute a pooled variance to compute a t statistic. c. Participants in both types of experiments are all measured the same number of times. d. The researcher must compute an estimated standard error for the mean difference score to compute a t statistic. For a repeated-measures experiment comparing two treatment conditions, the t statistic has a df of 11. How many subjects participated in this study? a.24 b.12 c.11 d.22 A matched-subjects experiment produced a t statistic with a df of 9. How many subjects participated in this study? a.10 b.9 c.18 d.20