PSYC 2002 Study Guide - Final Guide: Effect Size, Standard Error, Repeated Measures Design
17 Feb 2014
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Proportion=p= f n f=frequency n=for pop. n=for sample ss=sum of squares sample deviation= x m pop. )= x2 ( x2 (deff) = x2 ( x2 n (comp) sum of squares (sample) = Discrete:indivisable separate categories ex. # of kids continuous:infinite values nominal:colour ordinal:rank by size interval:ordered intervals. Ratio:interval w zero point descriptive stats:describe group of raw scores inferential stats:goes beyond data, can"t be manipulated unimodal:1. Peak bimodal:2 peaks multimodal:2+ peaks rectangular:0 kurtosis:how flat/peaked a distribution is leptokurtic:tall/peaked mesokurtic: Normal platykurtic:broad/flat correlational method:no control, no manipulation, observing ex. smoking experimental method:1 variable manipulated, other controlled, no confounds, cause/effect. Known df= ( m) z=m m / n 1 effect size(z)=d= M = pop. mean explained variability= r2= t 2 t 2+df effect size=d=( m 1 m 2 / sp. Whether 2 means are diff. enough to be from diff. populations sm 1 m 2. *when using this test, use df =df 1+df 2 to compare* Effect size: sm: d<0. 2 md: 0. 20. 8.
