One-Way ANOVA Calculator
Perform a one-way analysis of variance (ANOVA) to test whether the means of three groups are statistically different. Enter the mean, standard deviation, and sample size for each group.
ANOVA tests whether there is a statistically significant difference among group means.
Key Components
- SSB (Sum of Squares Between): Variation due to differences between group means
- SSW (Sum of Squares Within): Variation within each group
- F = MSB / MSW: Ratio of between-group to within-group variance
If the F-statistic is large enough (p < 0.05), at least one group mean is significantly different. ANOVA does not tell you which groups differ -- use post-hoc tests for that.