Bar Graphs and Line Graphs

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Bar Graphs and Line Graphs

• Lesson 7-4

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Bar Graph

• A bar graph uses vertical or horizontal bars to
  display numerical information.
• Bar graphs can be used to compare amounts.
• Choose an appropriate scale (with regular
  intervals).
• The bars should have the same width.

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Histogram

• A histogram is a bar graph that shows the
  frequency of each item. Histograms combine data
  into equal-sized intervals.
• There are no spaces between the bars on the
  histogram.

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Line Graph

• A line graph uses a series of line segments to
  show changes in data over time.
• Plot a point for each data item and then connect
  the dots with straight line segments.

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Refer to page 336 for the line graph.
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Homework Time