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Graphical representations of factorial experiments vary based on the nature of the variables involved. For instance, in a $$2 	imes 2$$ design, researchers might use a bar graph with a categorical variable like 'time of day' on the $$x$$-axis and 'cell phone use' indicated by different colored bars. Conversely, for a $$4 	imes 2$$ design that includes a quantitative variable, a line graph is typically used; here, the quantitative variable, such as 'psychotherapy length', is placed on the $$x$$-axis, while the categorical variable, like 'psychotherapy type', is represented by distinct line formats.

Example of Graphing Factorial Experiments

When graphing the results of a factorial experiment that includes one quantitative independent variable (e.g., length of psychotherapy) and one categorical independent variable (e.g., type of psychotherapy), which type of graph is typically used?

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