APBioKit
Since, according to the official CollegeBoard® AP® Biology website, calculator memories do not need to be cleared before or after the exam (probably because the CollegeBoard Anti-Cheating Administrator was bribed), here's a program that calculates Hardy-Weinberg variables and shows detailed instructions for using the in-built chi-squared function (TI-BASIC didn't display the results when I ran the built-in function, so I couldn't run the built-in chi-squared function from the program itself).