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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

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