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Homework Statement
Approx. 1/1000 has a disease, and the method of testing has a 5 % false positive rate. If a random person tests positive, what is the probability that he has the disease?
Homework Equations
I'm pretty sure Baye's theorem is the thing to use.
The Attempt at a Solution
I'm having trouble defining my probabilities. I've defined that P(sick) = 0,001 and P(not sick|+) = 0,05. But then I'm stuck...