Question: A lab test is 9 5 percent effective at detecting a certain disease when it is present. When the disease is not present, the test

 A lab test is 95 percent effective at detecting a certain disease when it is present. When the disease is not present, the test is 99 percent effective at declaring the subject negative. If 8 percent of the population has the disease, what is the probability that a subject has the disease given that his test is positive?

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