# 1.4 Graphs for Quantitative Data

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Sometimes information is collected for a quantitative variable measured on different segments of the population, or for different categories of classification.

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If the variable can take only a finite or countable number of values, it is a discrete variable.

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A variable that can assume an infinite number of values corresponding to points on a line interval is called continuous.

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The pie chart displays how the total quantity is distributed among the categories.

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The bar chart uses the height of the bar to display the amount in a particular category.

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See Example 1.5 for examples of both pie and bar charts.

©1998 Brooks/Cole Publishing/ITP