PSY 311 1st Edition Lecture 9Outline of Last Lecture I. Effect sizes II. Confidence Intervals Outline of Current Lecture I. Related conditions a. Repeated measures b. Matched subjects II. Difference scores III. Hypotheses IV. T statistic V. Effect size Current LectureI. Related Conditions a. Repeated measures ( within subject)- The same person is in the both conditions b. Matched subjects - Two different people in the different conditions but they have something in common- Matching them on some variable II. Difference Scores - When dealing with related conditions we use difference scores to compare membersof the two groups. - D = X2 – X1- To find the mean of the scores you use MD = ∑D/nIII. Hypotheses - H0: μD = 0- H1: μD ≠ 0 IV. T statistic - t = MD / sMD - df = # of differences - 1 V. Effect size - d = MD / s- r2 = t2 / (t2 +
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