UC知道学习概率论是遇到的问题
来源：百度知道 编辑：UC知道 时间：2024/06/07 14:00:29
由于学习概率论时使用的是国外的教程，英语不是很好，有一段文字看不太懂，希望能够得到大家的指点
a laboratory blood test is 95 percent effective in detecting a certain disease when it is,in fact,present.However,the test also yields a "false positive" result for 1 percent of the healthy persons tested.(That is,if a healthy person is tested,then,with probability 0.01,the test result will imply he has the disease.) If 0.5 percent of the population actually has the disease,what is the probability a person has the disease given that his test result is positive.
对这段英文看得不是太懂，希望能够帮忙翻一下
a laboratory blood test is 95 percent effective in detecting a certain disease when it is,in fact,present.However,the test also yields a "false positive" result for 1 percent of the healthy persons tested.(That is,if a healthy person is tested,then,with probability 0.01,the test result will imply he has the disease.) If 0.5 percent of the population actually has the disease,what is the probability a person has the disease given that his test result is positive.
对这段英文看得不是太懂，希望能够帮忙翻一下
一种实验室的血液测试能够检测出某种已知确切存在的疾病的概率为95%.这种测试把健康人检测成"阳性"的概率为1%(也就是说如果一个健康人接受检测,结果显示他有疾病的概率为0.01).如果一群人有疾病的概率为0.5%,那么当结果为阳性时该人有疾病的概率为多少?
实验室抽血化验法确诊概率为0.95。该实验同时将健康受测者误诊为“阳性”的概率为0.01（即某健康受测者，其被诊断为阳性的概率为0.01）。若抽样总体中疾病存在概率为0.5，则阳性受测者被确诊的概率为多大？
实验室血样试验在对某种疾病检验时百分之95有效, 但也会对健康受测人产生百分之1的"假阳性".(就是, 一个健康人受测, 试验结果有0.01的概率显示其患病.) 如果百分之0.5的人口真正患有此病, 一个受测结果为阳性的人他患病的概率为多少?