Khan Academy
Khan Academy: Welcome to Sql
SQL is useful for creating and querying relational databases. Learn how to use SQL with this interactive course! [2:04]
Bozeman Science
Bozeman Science: Graphing Data by Spreadsheet
Paul Andersen shows you how to create a scatter plot with a best fit line in Microsoft Excel. You can go here to download the data: http://www.bozemanscience.com/storage/sample%20data.xls