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14. Many organizations require their employees to be screened for drugs. Some employees are concerned that a “false positive” may be recorded from the screening; that is, employees who are not drug abusers may incorrectly test positive. Assume that 10% of a certain population are drug abusers. Suppose that the probability of a “false positive” is .5% and that the probability of a correct positive on someone who is under the influence of certain drugs is 99.9%. What is the probability that a person who tests positive is really a drug user?
(A) 0.0045
(B) 0.0999
(C) 0.1000
(D) 0.9569
(E) 0.9990
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統計： 尚無統計資料
統計： 尚無統計資料
