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Psychological Statistics (Spring 2021 - 32) Homework 5 (Chapter 11) - Problem 3 Dependent Samples t-Test (Ch. 11) Study Description and Data A researcher studies the effect of cognitive psychotherapy on positive self-regard. The number of positive state- ments made about oneself is recorded for each subject during the first meeting. After 8 weekly therapy sessions, the measures are repeated for each person. For the following data. Is there a significant treatment effect? Use a two tail test with a = .05. Number of Positive Statements D Subject Pre-Test (X1) Post-Test (X2) X2 - X1 D2 A B A OO ON CO M = 5.25 M = 7.25 ED = ED2 = Mp = Sample Variance (of D Scores) df =n-1 ED2 _ (ED)2 $2 = n d f Estimated Standard Error of D Scores SMD = V t Statistic t = MD - HD SMD Critical Value (t-Table p. 703) df =n-1 Critical value of t = Results Does cognitive psychotherapy have a statistically significant effect on positive self-regard