Multiple Choice
A university surveys how study group size (solo, duo, group) and study environment (quiet, noisy) affect test performance. Which of the following conclusions most clearly suggests an interaction effect between the two factors?
14. ANOVA
Two-Way ANOVA
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Which of the following interaction plots best indicates no interaction between the two factors?
A
B
C
D
Verified step by step guidance1
Understand that an interaction plot shows the relationship between two factors, where the lines represent different levels of one factor across the levels of another factor.
Recall that 'no interaction' between two factors means the effect of one factor is consistent across the levels of the other factor. In graphical terms, this is indicated by parallel lines in the interaction plot.
Examine each plot to see if the lines are parallel or if they cross or converge. Crossing or converging lines indicate interaction, while parallel lines indicate no interaction.
In the first plot, the lines cross each other, indicating an interaction between the two factors.
In the second plot, the lines are roughly parallel, which suggests no interaction between the two factors.
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