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August 29, 2014

Homework Help: Probability

Posted by DAS on Wednesday, February 4, 2009 at 12:56am.

Suppose the prevalence of people with certain cancer in a give year is 0.015. In addition suppose that the diagnostic test for this cancer is know to have a false positive rate of 0.05 and a false negative rate of 0.10 . Suppose a person is aware of the false positive and false negative rates for this exam. So when he gets a postitive result he takes the exam again

a) if the second test is also positive what are his chances of actually having cancer
b) if the second test is negative what are his chances and should he get another test?

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