Let the variable X be someone's disease status X = D then someone has strep throat X = Dc then someone does not have strep throat Let the variable Y be someone's test result Y= + is a positive test indicating the test detected strep throat Y = - is a negative test indicating the test did not detect strep throat     Y=+ Y=- X=D 36 17 X=Dc 13 20   Calculate the probability that someone who is known to not have strep throat will get a negative test result

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