You can find old tests through the study guides. The teacher might also be willing to give you some old tests to help you to prepare.
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I'm in AP Statistics and if you co to collegeboard.com and go to the AP section and click on AP Statistics there are all the free response questions from the previous 10 years AP tests.
What is the answer
To receive help with the AP statistics investigative task answers for chapter 21 it is best to contact the instructor. This will insure that the correct methods for solving the problems is given. There are not any answers available online for this.
You can get the answers to your quiz in a lot of places. One being your notes that you took during the class.