PSYC 394 Lecture Notes - Lecture 8: Microsoft Powerpoint, Analysis Of Variance
Document Summary
Xmean-light = 7. 32; xmean-mod = 7. 54; xmean-heavy = 8. 18. Ssb = ni (xi - xgrandmean)2. Effect of the interaction of variables a and b. Ssm = ssa + ssb + ssaxb or ssaxb = ssm ssa ssb. Dfaxb = dfm dfa dfb. Ssr = (xi - xgroupmean)2 or s2 i (ni 1) Each of the above f ratios, when tested at an alpha level of 0. 05, proved to be significant. It is then necessary to follow up significant main effects and interaction effects with either planned compar- isons or post hoc tests. Planned comparisons: see "standard contrasts" chart on powerpoint slides (both orthogonal and non-orthogonal tests included) Post hoc tests (do not follow up main effects between only two groups; the significant difference can only be between those two means!) Hypothesis 1: comparing the effect of light exercise to moderate/heavy exercise light = 2; moderate = 1; heavy = 1.
