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This is a conditional probability problem where P(B | A) = P(A and B) / P(A). Assume that the test for some disease is 99% accurate.
This is a conditional probability problem where P(B | A) = P(A and B) / P(A).
Assume that the test for some disease is 99% accurate. If somebody tests positive for that disease, is there a 99% chance that they have the disease?