Going back to my high school days in the early 70's I've always needed to know how to use statistics for solving technical problems. Back then I used a slide rule; now I use a high power PC. Hopefully my answers are still correct!
One software package that I have used in recent years is Minitab. Recently I found an excellent online text book which covers Minitab 15 ... from "frequency distribution" to "confidence intervals" and "hypothesis testing". I will add this test to my Engineering Learning Wiki eBook / Manual section.
- Minitab 15 Manual - Thiel College