Statistical Analysis

Statistical Analysis You SHOULD Perform 1? Normality test (assumption) * ShapiroWilk * KolmogorovSmirnov Purpose check ANOVA suitability 2? Descriptive statistics For each group: * Mean * Standard deviation * CV This describes your data. 3? Levene test (very important) Checks: Equality of variance Needed before ANOVA. 4? Three-way factorial ANOVA (MAIN TEST) Because you have 3 factors: Factors: * Material * Surface * Primer Three-way ANOVA tests: Material effect Surface effect Primer effect Material Surface Material Primer Surface Primer Material Surface Primer This is your most important analysis 5? Post-hoc comparisons After significant ANOVA: Use: Tukey (most common) or Bonferroni To know which groups differ. 6? Effect size (recommended) Report: * Partial eta squared Shows strength of effect