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Unformatted text preview: 3-24-11Statistical Analysis: What Do Your Data Show?Analyzing two-group designsoNeed to decide which t test to useThis depends on how you assigned Ss to groupsIndependent groups design = t test for independent samplesCorrelated groups design = t test for correlated samplesoInterpreting computer statistical outputExamine descriptive statisticsNeed to double check everything you entered and check printout to see if it seems accurateIf only n=7 and you know n=8 then computer didnt read something and now you are interpreting junk datao(BOOK TABLE 10-1)oThe t test for independent samplesCheck for Homogeneity of variance: assumption that variances are similarTo use a t test we assume the variances are similarLook at Fmax test see says F=1.634 p=.222Rule: if p is greater than .05 then variances are similar, if less then variances are differentCohens d is the affect size (you want a large affect size; in order to have a large one you have to have .8 or largerhave a large one you have to have ....
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- Spring '11