A supreme court from a certain region recently ruled that employees can be tested for drugs...

A supreme court from a certain region recently ruled that employees can be tested for drugs only if management has reasonable cause to administer the test. An article in a certain magazine focused on the misclassification rates of such drug tests. A false positive occurs when a drug test administered to a non-drug user yields a positive result. A false negative occurs when a drug test administered to a drug user yields a negative result. Complete parts a and b. a. The author presented the following scenario: Suppose that 6% of a population of workers consists of drug users. The drug test has a false positive rate (the probability of a positive drug test given the worker is a non-drug user) of 8% and a false negative rate (the probability of a negative drug test given the worker is a drug user) of 3%. A worker selected from this population is drug tested and found to have a positive result. What is the probability that the worker is a non-drug user?

Apply Bayes' Rule to obtain your answer. 0.5637

(Round to four decimal places as needed.)

b. Recall that in the region, drug tests can be administered only with probable cause. Hence, for workers that are tested, it is likely that a high proportion of them use drugs. Now consider a population of workers in which 89% are drug users. Again, assume the false positive rate of the drug test is 8% and the false negative rate of the drug test is 3%. A worker selected from this population is drug tested and found to have a positive result. What is the probability that the worker is a non-drug user? nothing (Round to four decimal places as needed.)

Expert Solution

orchestra answered 2 years ago

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