Should I change calculators for stats?
I'm taking a summer course on stats. Currently I have a ti-89 and the instructor allows us to use any calculator, but he only has support for 83. If I want to use the 89, I need to download software or something. Are there any advantages of using the 89 over the 83? I like the formatting of the 89, how it is computer like and how you can edit values you have entered just by scrolling up.
Stats wise, are there any other advantages though? Or disadvantages? I'm trying to decide if it's worth it to buy the 83 for this class.