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1.4  Graphs for Quantitative Data

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

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

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

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

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

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

©1998 Brooks/Cole Publishing/ITP

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