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You should use a bar chart when you have a categoric or an ordered independent variable and a continuous dependent variable. You should use a line graph when you have continuous data E.g continuous dependent. So if you wanted to show individual totals like sales for each month of the year, each could be a separate bar. You could use a line chart to show how changes are on a continuous basis.

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11y ago
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Q: When should you use a bar chart and when should you use a line graph?
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