If the interaction is significant, a Tukey HSD is not appropriate.

Name: If the interaction is significant, a Tukey HSD is not appropriate.
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Quizplus · Accepted Answer

A Tukey HSD test is used for post-hoc analysis to find which specific group means are different after finding a significant ANOVA result. If there is a significant interaction, it suggests that the effect of one factor depends on the level of another factor, and a simple Tukey HSD may not adequately address this complexity.

If the Interaction Is Significant, a Tukey HSD Is Not