| Bar chart | A graph used for qualitative data in which the classes are reported on the horizontal axis and the class frequencies on the vertical axis.
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| Class interval | The size or width of the class.
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| Class frequency | The number of observations in each class.
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| Class midpoint | The point halfway between the lower limits of two consecutive classes.
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| Cumulative frequency distribution | A grouping of data into mutually exclusive classes showing the number of observations at or below the upper limit of each class.
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| Cumulative frequency polygon | A graph that consists of line segments connecting the points formed by the intersection of the class upper limit and the class cumulative frequency.
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| Frequency distribution | A grouping of quantitative data into classes showing the number of observations in each mutually exclusive class.
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| Frequency table | A grouping of qualitative data into mutually exclusive categoriess showing the number of observations in each category.
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| Frequency polygon | A graph that consists of line segments connecting the points formed by the intersection of the class midpoint and the class frequency.
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| Histogram | A graph in which the classes are marked on the horizontal axis and the class frequencies on the vertical axis. The class frequencies are represented by the heights of the bars and the bars are drawn adjacent to each other.
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| Pie Chart | A chart that shows the proportion or percent that each class represents of the total.
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| Relative class frequency | Shows what fraction each class is of the total number of observations.
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