Conclusion
We have now looked at a number of different graphs and charts, all of which were potentially misleading. We hope that from now on if you have to work with a graph or a chart, you will always consider the following points:
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look carefully at any horizontal or vertical scale that is given;
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consider each graph or chart separately, don't compare them unless you are sure that they have the same scales;
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if it is not easy to interpret the graph or chart, trying reading off some values.