MegaStat is an Excel add-in that can perform a wide range of statistical procedures. I highly recommend its use. In some of our classes, we make the Windows version (for Excel 2003, 2007, or 2010) and the Macintosh version (for Excel 2011) available for free download from the course's Materials tab -- it's part of the package deal that we have with the textbook publisher.
To download and install it, you must follow the instructions on the download page.
If you are not in one of those classes, you can purchase MegaStat inexpensively.
How to Purchase MegaStat
If you are in a course that does not provide MegaStat for free, you can still own a copy. McGraw-Hill will happily sell you one for use in Windows Excel 2003, 2007, or 2010 or in Macintosh Excel 2011.
To buy your own copy, click this link:
You'll be on this page. If the page is still claiming that the price is $10, as in this image, ignore it. The price is a bit higher than that.
Click on the "Student Edition" link, and you'll see this:
Click the "Download MegaStat" link and you'll see this:
Click the "purchase access" link and you'll see this form, which you can fill out to buy your copy of MegaStat. You will then have ten days to download the product. Store the installation file(s) away in a safe place. If you need them after your ten day period ends, you'll have to pay again.