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? asked in Science & MathematicsMathematics · 7 years ago

How to solve statistics problems?

Ok, the problem is hard to type onto something like this because it involves a chart so here is a photo of the problem:

http://i.imgur.com/I9M86nv.png

Here are the two questions:

1. What is the probability that the EIA is positive for a randomly chosen person from this population?

2. What is the probability that a person has the antibody given that the EIA test is positive?

Please explain the methods used to solve this. Thank you.

1 Answer

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  • M3
    Lv 7
    7 years ago
    Favorite Answer

    P[antibodies present & +ve] = 0.996*4 % = 3.984%

    P[antibodies absent & +ve] = 0.004*96 % = 0.384%

    1. P[+ve] = 4.368% <------

    2. P[has antibody | + ve] = 3.984/4.368 = 91.21% <------

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