PHstat Excel

I'm taking an Economics Statistics class at my University and we require using the program PHstat through excel to create a lot of the histograms and graphs. Unfortunately, the PHstat that came with the materials only works with Windows. Does anyone know of an equivalent program I could use for my mac that has almost the same functions as PHstat?
Here's the link for those of you unfamiliar with PHstat.

http://www.prenhall.com/phstat/

Thanks,
Ryan

I found this but the price is $450.00.

http://www.xlstat.com/en/home/

You might want to consider running Windows in Fusion or Parallels on your machine. Or, save the cost of virtual software and run Windows in a Boot Camp partition on your Mac. You can then install Office 2007 and run Excel.

Regards.

Thanks for the reply. I'll check around some more. I have office 2008 mac edition installed, I just need to PHstat function for producing histograms. Kind of a pain to do all that just for a few graph:/