How about if one subject is selected what is the probability than?

Probability of selecting a subject who had positive test result or does not use drugs? 2. Probability subject had a negaive test result given the subject actually uses drugs? Probability the subject actually uses drugs given that the subject had a negative test result? Please help and explain, thank you

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asked Oct 20, 2016 in STATISTICS by anonymous
reshown Oct 20, 2016 by goushi

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How about if one subject is selected what is the probability than?

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