of percentages rather than the number of persons. All three bar graphs are the same height and each bar is divided

according to the percentage of population in each age group.

Figure A7 and Figure A8 show how the bars can represent countries or years, and how the vertical axis can

represent a numerical or a percentage value. Bar graphs can also compare size, quantity, rates, distances, and

other quantitative categories.

Comparing Line Graphs with Pie Charts and Bar Graphs

Now that you are familiar with pie graphs, bar graphs, and line graphs, how do you know which graph to use for

your data? Pie graphs are often better than line graphs at showing how an overall group is divided. However, if

a pie graph has too many slices, it can become difficult to interpret.

Bar graphs are especially useful when comparing quantities. For example, if you are studying the populations
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