Class: Lab 12 (t-Test for Related Samples) 1. A repeated-measures study comparing two treatments with n = 4 participants produces MD = 2 and SS = 75 for the difference scores. What is the estimated standard error for the sample mean difference? a. 25 b. 25/4 = 6.25 c. 5 d. 2.5 2. What is the value of the estimated standard error for the following set of D-scores? Scores: 2, 2, 10, 2 a. 3 b. 3 C. 4 d. 2 3. For a repeated-measures study comparing two treatment conditions, a researcher obtains a sample of n = 9 difference scores with a mean of MD = 4 and a variance of s = 36. What is the value for the repeated-measures t statistic for these data? a. 4/2 b. 4/4 C. 4/6 d. 4/36 4. A researcher obtains t = 2.25 for a repeated-measures study using a sample of n = 10 participants. Based on this t value, what is the correct decision for a two-tailed test? a. Reject the null hypothesis with a = .05 but not with a = .01 b. Reject the null hypothesis with both a = .05 and a = .01 c. Fail to reject the null hypothesis with both a = .05 and a = .01 d. Cannot make a decision without additional information 5. For the following data from a repeated-measures study, calculate the mean difference. Don't forget that when you're subtracting a large number from a small number that you get a negative number! MD = Participant X1 (music) A X2 (no music) D B