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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 groups•Independent groups design = t test for independent samples•Correlated 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 accurate•If only n=7 and you know n=8 then computer didn’t 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 similar•Look at Fmax test see says F=1.634 p=.222•Rule: if p is greater than .05 then variances are similar, if less then variances are different•Cohen’s 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
- Statistics, Cohen, Statistical significance, Groups Design, correlated samples