Line Graph

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Line Graph
  • A graph used to represent the relationship between two continuous variables.
  • Similar to a bar graph in which the height of each bar is represented by a single point (instead of the bar), with each of these points connected by a line.
  • Best used to show change over time.
  • Use a graph with 2 or more lines, with each line representing a different group or population, to visually display differences among the groups.

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Tip: Be careful NOT to use a line graph when the X-axis is a categorical (also called nominal or qualitative) variable. If the X-axis variable represents distinct groups (e.g., different schools) use a bar graph instead.


Include an example that shows how limiting the scale can lead to distorted interpretations.

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