In a two-way ANOVA,interaction between groups and blocks occurs when differences in group efforts are not distributed uniformly across blocks.

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Interaction between groups and blocks occurs when the effect of one factor (group) on the outcome variable (effort) differs depending on the level of the other factor (blocks). This means that differences in group efforts are not consistent across all blocks, indicating an interaction between the two factors.

In a Two-Way ANOVA,interaction Between Groups and Blocks Occurs When