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Math Help - conditional probabilty

  1. #1
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    conditional probabilty

    a test for disease is such that it correctly detects the disease in 90% of the ppl who actually have the disease. also if a person does not have the diease, the test will report that he does not have it with a probability 0.9. only 1% of the ppl has the disease. if a person is chosen at random, and the test indicates that he has the disease, what is the conditional probabilty that he have the disease? is the test reliable?
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  2. #2
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    Quote Originally Posted by alexandrabel90 View Post
    a test for disease is such that it correctly detects the disease in 90% of the ppl who actually have the disease. also if a person does not have the diease, the test will report that he does not have it with a probability 0.9. only 1% of the ppl has the disease. if a person is chosen at random, and the test indicates that he has the disease, what is the conditional probabilty that he have the disease? is the test reliable?
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