Minitab

If you didn't get Minitab with your textbook, you can "rent" it for 6 months ($30) or a year ($50) or get a 30-day free trial version.

http://www.minitab.com/products/minitab/demo/default.aspx

** Props to Patrick Feeney for providing that tip **

The data files are provided in Excel format also, along with a set of templates for doing the calculations.