The 13% is relevant to the problem. If you don't use it then you aren't going about the problem correctly.
http://i.imgur.com/9UELFY5.png
Here is the problem in question. I have the answers for both of these already,but I am not sure I have 2b correct.
http://i.imgur.com/9NmUgD8.png
Here are the probability for 2a For 2b I just thought you had to take 95/(95+15) to get the probability, is that right or do I need to include the 13% somehow?
The 13% is relevant to the problem. If you don't use it then you aren't going about the problem correctly.
I don't have emotions and sometimes that makes me very sad.
That's not the conventional way we would do it but it should give a correct answer. Note that you'll need to figure out P(positive) and P(negative) to go this route.
I don't have emotions and sometimes that makes me very sad.
After doing some searching:
The probability that someone tests positive is (0.95)(0.13) + (0.15)(0.87).
So I want want (0.95)(0.13)/((0.95)(0.13) + (0.15)(0.87)), which gives me 48.62% someone is doping?
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