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).
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A Scale Should Make The Graph Readable
label the axises
you should use a bar graph
I believe trends in data should be presented in a graph.
I don't