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I had this discussion with a friend over a beer last night and we couldn't agree on the answer. Here's the scenario: 
 
The incidence of a disease in a population is 1:1000
There is a test which correctly detects the disease 95%of the time
If I test positive with the test what is my risk of having the disease?
 
Be interested in any thoughts on the "correct" answer.
 
Cheers
 
Simon