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Unformatted text preview: probably no more than 2530. As the size ofthe sample increases, the shape ofthe underlying curve is altered and the tstatistic is less ofan appropriate standard. Ifit is larger than that, then you would probably use an F test. . ,Types of Samples for ttest Dependent samples t: , "Same basic format, but the two 'groups' are really the same subjects, measured at two different times Usually pre/post. Sometimes use matched groups instead of same subs Single sample t: 'Instead ofcomparing two groups, comparing data from one group to some number you already know (kind oflike 'simulating' data from second group) Effect Size The effect size is a way oftelling how variation in one variable is related to variation in another variable. It is usually calculated as correlation. Square the correlation and you get "percent variance accounted for". The reason you would wonder about this is that just because you get a significant...
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This note was uploaded on 03/05/2010 for the course PSYCH psych 7 taught by Professor Revlin during the Fall '09 term at California State University , Monterey Bay.
 Fall '09
 revlin

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