A drug-screening test is used in a large population of people of whom 4% actually use drugs. Suppose that the false positive rale is 3% and the false negative tale is 2%. Thus a person who uses drugs tests positive for them 98% of the time, and a person who does not use drugs tests negative tut them 97% of the time.
a.What hat is the probability that a randomly chosen person who tests positive for drugs aclually uses drugs?
b.What is the probability that a randomly chosen person who tests negative for drugs does not use drugs?
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