A Scale Should Make The Graph Readable
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Clear legend (or key). Clear labelling of axes including values. Scales selected to maximise discrimination between values. No use of 3 dimensional graphics. Then there are some things are are specific to the type of graph. For example, a pie or circle graph should not have more than 7 segments. The segments should not be less than 2% (around 7 degrees).
label the axises
you should use a bar graph
I believe trends in data should be presented in a graph.
I don't