Besides normality, ANOVA assumes the populations have equal:

1. Two assumptions concern the shape and spread of the populations. 2. Each population from which a sample is taken is assumed to be normal. 3. The populations are assumed to have equal standard deviations. 4. Equal standard deviations is the same as equal variances. _Source: OpenStax Introductory Statistics 2e (CC BY 4.0), Ch 13 'The F Distribution and One-Way ANOVA', sections 13.1-13.4_