Clearly, we all want to teach with the best technology we can. However, I do argue that, regardless of how students may have learned, calculators should be forbidden on exams - both those during the term and the AP exam. I offer several arguments. Students in AP stats need to learn to read computer output. Given the need to read computer output, students should see analyses on exams that present computer output and be expected to read and interpret it.
Calculators are a distraction on exams.
Students tend to rely on them blindly hoping that by hitting the right keys they'll get the right answer. This encourages student to think that the right answer is a number. Without this crutch, students are encouraged to think more about the data and the analysis of it, and to recognize that statistics is not about getting the right numeric result. Tables serve quite well for normal, t, and chi-square critical values. The argument that if students learn with calculators they should be able to use them on exams is specious.