Other
Hubspot: Data Visualization 101: How to Design Charts and Graphs
Your data is only as good as your ability to understand and communicate it, which is why choosing the right visualization is essential. Learn more in this guide.
The Franklin Institute
Frankin Institute Online: Group Graphing
This site from The Franklin Institute explores how to make a simple graph using a spreadsheet to portray survey data. It also gives a set of interesting sports-related web sites so that students can get statistical inforamtion.
Other
The Topic: Charts and Graphs
Brief descriptions of charts and graphs, followed by links to larger sites on the same subject.