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   1. Calculate the probability that someone who is known to not have strep throat will get a negative test result I've been told 0.5405 and 0.6061 as possinle answers.  2. Calculate the Specificity of the test Round your answer to 4 decimal places.

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