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| Summary |
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 In a simple bar graph, the height of each bar represents the frequency. |
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| The thickness has no significance. All bars to have the same thickness. |
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We use double bar graph when we want to compare two things. |
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In the pie chart, |
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In the frequency polygon, the frequency is plotted against the mid value of each class. These points are joined by line segments. |
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For a histogram, we mark class intervals on X axis and frequencies on Y axis. Class intervals must be exclusive. We draw rectangles with class intervals as bases and corresponding frequencies as heights. |
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