Recent content by susan_poland

Well, the first task was to use Bayes formula and I did this like that: P(U) = 0.5% P(N) = 99.5% P(CU|U) = 99.0% P(CN|U) = 1.0% P(CU|N) = 2.0% P(CN|N) = 98.0% P(U|CU) = [P(CU|U)*P(U)] / P(CU) P(U|CU) = [P(CU|U)*P(U)] / [P(CU|U)*P(U) + P(CU|N)*P(N)] P(U|CU) = [99% * 0.5%] / [99% *...

Assume that a narcotics test gives positive results in 99% for drug users. For people not using narcotics the test gives negative results in 98% of cases. A company decided to test its employees knowing that 0.5% of them use drugs. Estimate the probability that a person with a positive test...