In a two-factor ANOVA design with replication, the null hypothesis for testing whether interaction exists is that no interaction exists. The alternative hypothesis is that interaction does exist.

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In a two-factor ANOVA with replication, the null hypothesis for testing interaction between the two factors indeed states that no interaction exists between them. The alternative hypothesis posits that there is an interaction, meaning the effect of one factor depends on the level of the other factor.

In a Two-Factor ANOVA Design with Replication, the Null Hypothesis