Term
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Definition
| Special graphical formats used to portray a frequency distribution, including histograms, frequency polygons, and cumulative frequency polygons. Other graphical devices used to portray data are line charts, bar charts, and pie charts. |
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Term
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Definition
| The interval in which the data are tallied. For example, $4 up to $7 up to $11 is another class. |
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Term
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Definition
| The number of observations in each class, 16 observations in the $4 up to $6 class, 16 is the class frequency. |
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Term
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Definition
| Each observation must fall into one of the categories. |
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Term
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Definition
| A grouping of data into classes showing the number of observations in each of the mutually exclusive classes. |
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Term
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Definition
| A graphical display of a frequency or relative frequency distribution. The horizontal axis shows the classes. The vertical height of adjacent bars shows the frequency or relative frequency of each class. |
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Term
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Definition
| The value that divides the class into two equal parts. For the classes $10 up to $20 and $20 up to $30, the midpoints are $15 and $25, respectively. |
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Term
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Definition
| A property of a set of categories such that an individual, object, or measurement is included in only one category. |
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Term
| Relative frequency distribution |
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Definition
| A frequency distribution that shows the fraction or proportion of the total observations in each class. |
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