試題詳解

24. A blood test indicates the presence of a particular disease 95% of the time when the disease is actually present. The same test indicates the presence of the disease 0.5% of the time when the disease is not actually present. One percent of the population actually has the disease.
Calculate the probability that a person actually has the disease given that the test indicates the presence of the disease.
(A) 0.324
(B) 0.657
(C) 0.945
(D) 0.950
(E) 0.995