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:
look carefully at any horizontal or vertical scale that is given;
consider each graph or chart separately, don't compare them unless you are sure that they have the same scales;
if it is not easy to interpret the graph or chart, trying reading off some values.