Editing Analysis of variance (section)

====Power analysis====
[[Statistical power|Power analysis]] is often applied in the context of ANOVA in order to assess the probability of successfully rejecting the null hypothesis if we assume a certain ANOVA design, effect size in the population, sample size and significance level. Power analysis can assist in study design by determining what sample size would be required in order to have a reasonable chance of rejecting the null hypothesis when the alternative hypothesis is true.<ref>Howell (2002, Chapter 8: Power)</ref><ref>Howell (2002, Section 11.12: Power (in ANOVA))</ref><ref>Howell (2002, Section 13.7: Power analysis for factorial experiments)</ref><ref>Moore and McCabe (2003, pp 778–780)</ref>
[[File:Effect_size.png|thumb|Effect size]]