When the variables are independent, the vectors are orthogonal. Then the standard deviation of the sum or difference of the variables is the hypotenuse of a right triangle. You probably won’t discuss orthogonal vectors with your AP Statistics students, but that’s no excuse for not giving the Pythagorean theorem the emphasis it deserves. Learn standard deviation chapter 6 ap statistics with free interactive flashcards. Choose from 500 different sets of standard deviation chapter 6 ap statistics flashcards on Quizlet.

Feb 20, 2017 - Explore andabarefoot's board "standard deviation" on Pinterest. See more ideas about Standard deviation, Ap statistics and Statistics math. So in statistics, we just define the sample standard deviation. And the one that we typically use is based on the square root of the unbiased sample variance. But when you take that square root, it does give you a biased result when you're trying to use this to estimate the population standard deviation. But it's the simplest, best tool we have.