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March 29, 2017

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Wendy is a randomly chosen member of a large female population, in which 13% are pregnant. Wendy tests positive in a pregnancy test. Pregnancy test correctly identifies pregnancy 91% of the time and correctly identifies non pregnancy 95% of the time. What is the probability that Wendy is pregnant given the positive test result ?

  • statistic - ,

    Why wouldn't it be .91?

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