Statistical Analysis of Experimental Data: Comparing Performance between Two Groups, Exercises of Psychology

Download Statistical Analysis of Experimental Data: Comparing Performance between Two Groups and more Exercises Psychology in PDF only on Docsity! Assignment 1. Sixteen subjects were randomly assigned to one of two groups in an experiment investigating the effect of stress on test-taking performance. Subjects in group 1 completed a 100-item test with no time limit, while subjects in group 2 were allowed only 30 seconds to complete each item on the same test. The following data were obtained: Group 1 Group 2 86 72 72 57 78 65 74 72 83 86 72 48 81 54 74 41 x1 = 77.5 x2 = 61.875 s1 = 5.35 s2 = 14.69 Is there any significant difference between the performance of the two groups? (α ≤ .05) 2. The same experiment was now repeated with a sample of 25 subjects. Again, group 1 did the test with no time limit and group 2 was timed, yielding the following data: Group 1 Group 2 72 64 84 85 81 58 76 76 79 83 83 56 83 92 72 81 81 72 80 60 83 64 80 88 ______ 55 n1 = 12 n2 = 13 x1 = 79.5 x2 = 71.85 s1 = 4.123 s2 = 13.088 Docsity.com