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Both bar graphs and line graphs serve a fundamental similarity: they illustrate differences in the average score of a dependent variable across the levels of an independent variable. However, the standard convention is to utilize a bar graph for categorical independent variables and a line graph for quantitative or continuous independent variables.

Comparing Bar and Line Graphs

According to standard graphing conventions, a bar graph should be used when the independent variable is categorical, whereas a line graph should be used when the independent variable is quantitative or continuous.

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