If the means from a two-factor study are displayed in a graph, how can you determine whether there is an interaction between factors?
What will be an ideal response?
When the means of a two-factor study are displayed in a graph, each level of one factor is represented by a different line. As you scan across the graph from left to right, if there is a constant distance between the lines, then there is no interaction. In other words, if the lines are parallel, there is no interaction. However, if the distance between lines changes, then there is an interaction. In other words, if the lines converge or cross, there is an interaction.
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