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  • 概率論一道題,求教

    概率論一道題,求教
    Do you have a rare disease?Suppose that 1 in 633 people have a particular disease.You go to the doctor and they suggest that you be tested for the disease.The test will accurately give a positive test result with probability 0.94,and will accurately give a negative test result with probability 0.81.If the test comes back positive,what is the probability you have the disease?
    其他人氣:796 ℃時間:2020-04-03 17:56:50
    優(yōu)質(zhì)解答
    A1表示患病,A2表示無病 ,B表示檢查陽性
    根據(jù)貝葉斯公式和全概公式,所求條件概率P(A1|B)=P(B|A1)P(A1)/[P(B|A1)P(A1)+P(B|A2)P(A2)]=(1/633 *0.94)/(1/633* 0.94 + 632/633 *0.19) =47/605 約為0.0078(由于無病誤診為陽性的概率0.19太高導(dǎo)致結(jié)果極不可信)
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