If you are studying statistics as part of your senior mathematics classes at high school then you would be crazy not to use a graphics display calculator. And one of the best ones currently available is the TI-Nspire CX.
Now, as I've been promising, here is a book to help you make the most of your TI-Nspire, and maybe up your exam grade.
I'd be very surprised if most students reading this book don't find new ways to use their calculator more effectively.