For the data part, I only picked the professors with more than 10 rates to ensure the validity of data. The quality is calculated by the average of three category in Rate My Professor: helpfulness, clarity, and easiness. I drew several graphs using different selection of data (for example, calculate quality by only averaging helpfulness and clarity) and found that it was not deceptive enough.
Also, I tried bar chart, column chart, pie chart, and so on. Finally I found that line chart can show trend, and the area chart is usually misleading in the size. That was why I chose them.
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