I understand your point, but I have to point out that your scatter plot is not correct. Scatter plots are used to compare/correlate two variables, such as amount of time studying and scores on a test. Simply plotting students and test scores with a point is not a scatter plot.
When graphing qualitative data, bar graphs and circle/pie graphs are used. When graphing quantitative data, histograms are used, along with line graphs and scatter plots. Histograms are used to show frequency of data points. Line graphs are used to show data collected continuously over time. And scatter plots correlate two variables, as mentioned above.
Granted, I have taught for 17 years, I'm on 18. I didn't know this stuff until 2009 when I was writing my Master's paper... it turns out that where I teach, we actually teach this to our middle school science students. Go figure!
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