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The probability isP(you have the disease)*P(the test shows positive when testing someone with the disease) +

P(you don't have the disease)*P(the test shows positive when testing someone without the disease).


The second category is particularly important if the disease is rare but the probability of a type II error is large.

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Q: What is the probability of testing positive for the disease?
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The knowledge of probability impacts one's understanding of drug testing or tests for a particular disease because the test parameter could come out either as true or false, making the probability to be 1/2 for either scenario or status.


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