When selecting the appropriate graph type based on the data you want to graph, keep the following in mind:

 

Bar graphs are used to show quantities for items within one topic area.  For example, wanting to graph favorite soda pop flavors as your topic area, using the “items” of Coke (10 people), Sprite (5 people), and Orange (7 people). 

 

Line graphs are used to show changes in quantity over time.  For example, wanting to graph the change in population over 4 consecutive years. 

 

Circle graphs are used to show the portions or percentages that certain parts make up of a larger category.  For example, wanting to graph the percentage of boys and girls in a classroom. 

 

Pictographs are used to show quantities of items (like the bar graph) using symbols.