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3-24-11

# 3-24-11 - Statistical Analysis What Do Your Data Show...

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3-24-11 Statistical Analysis: What Do Your Data Show? Analyzing two-group designs o Need to decide which t test to use This depends on how you assigned Ss to groups Independent groups design = t test for independent samples Correlated groups design = t test for correlated samples o Interpreting computer statistical output Examine descriptive statistics Need 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 data o (BOOK TABLE 10-1) o The t test for independent samples Check for Homogeneity of variance: assumption that variances are similar To 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 larger

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3-24-11 - Statistical Analysis What Do Your Data Show...

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