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Suppose a drug test is 93% sensitive and 89% specific. That is, the test will produce...

Suppose a drug test is 93% sensitive and 89% specific. That is, the test will produce 93% true positive results for drug users and 89% true negative results for non-drug users. Suppose that 4.5% of people are users of the drug. If a randomly selected individual tests positive, what is the probability he or she is a user?

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