Chapter 12

One-Way Between-Groups ANOVA

dfbetween = Ngroups − 1

dfwithin = df1 + df2 +…+ dflast

(in which df1 etc. are the degrees of freedom, N − 1, for each sample)

dftotal = dfbetween + dfwithin or dftotal = Ntotal − 1

SStotal = Σ(XGM)2 for each score

SSwithin = Σ(XM)2 for each score

SSbetween = Σ(MGM)2 for each score

SStotal = SSwithin + SSbetween

Effect Size for a One-Way Between-Groups ANOVA

EP-3

Tukey HSD post-hoc test

, if equal sample sizes

, if unequal sample sizes

, for any two sample means