What is the probability a test comes back positive for drugs

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You are the administrator for a drug screening program. The drug screening test correctly detect the presence of drugs 99.8% of the time. The test will falsely detect the presence of drugs 1.5% of the time. Assuming that a random person has a 0.5% chance they use drugs, answer the following:

Note: P(test positive | drugs present) = .998

P(test positive | drugs not present) = .015

P(drugs present) = .005

a. What is the probability a test comes back positive for drugs?

Reference no: EM132191931

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