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A graph is a way to represent data visually. A good
graph can make a great deal of complicated measurements easy to understand.
Different graphs are better for representing different kinds of data. |
| PIE GRAPH:
A pie graph is best for showing how a group is divided up. If you want to
show what percentage (or what portion, or what fraction) of a group falls
into each of a number of categories, you would use a pie graph. |
| BAR GRAPH: A bar graph is best for showing how one variable is affected by another characteristic. Generally, with a bar graph, only one variable is a measurable trait and so it is the only one to have a number associated with it. This variable is plotted on the Y-axis. The other characteristic is usually not measurable. |
| PICTOGRAPH: A pictograph is virtually the same as a bar graph. Pictures are used in place of plain bars, however. Usually the picture is a symbolic representation of some aspect of the data. |
LINE GRAPH: A line graph is best for showing how one variable affects another variable. Generally, with a line graph, both variables are measurable traits and so both have a number associated with them. |
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