1) when sample means are dramatically positively skewed
2) when sample means are dramatically negatively skewed
3) after an anova test when H0 is rejected
4) if the Turkey HSD test produces a significant effect
Post-hoc tests (or post-hoc comparison tests) are used at the second stage of either an ANOVA or MANOVA test if the null hypothesis is rejected.
SOLUTION: Choice 3) after an ANOVA test when H0 is rejected.
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