Bar, line or pie?
One set of facts can be drawn three ways. The question decides which chart to use.
Step 1 of 3
- A bar chart. Four classes side by side. Compare them.
- A line graph. People at a fair, hour by hour. See the change.
- A pie chart. 12 students in three groups. See the shares.
The rule
A bar chart compares groups. A line graph shows change over time. A pie chart shows parts of a whole.
A pie chart needs parts that add up to one whole. Each slice is one share, one part of that whole. One pie chart shows one moment. So a pie chart cannot show a change by itself.
A bar chart can also compare a few weeks. A line graph joins the points and shows how the value moved.
Read each question. Pick its chart.
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