bar represents a certain entity, like a country or a group of people. The bars on a bar graph can also be divided

into segments to show subgroups.

Any graph is a single visual perspective on a subject. The impression it leaves will be based on many choices,

such as what data or time frame is included, how data or groups are divided up, the relative size of vertical and

horizontal axes, whether the scale used on a vertical starts at zero. Thus, any graph should be regarded

somewhat skeptically, remembering that the underlying relationship can be open to different interpretations.

Review Questions

Exercise A1

Name three kinds of graphs and briefly state when is most appropriate to use each type of graph.

Exercise A2

What is slope on a line graph?

Exercise A3

What do the slices of a pie chart represent?

Exercise A4
518 A • The Use of Mathematics in Principles of Economics

Why is a bar chart the best way to illustrate comparisons?

Exercise A5
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