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anonymous

  • 5 years ago

need help with a probabilility question

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  1. anonymous
    • 5 years ago
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    98% of those who have HIV test positive while 1.5% who do not have HIV test positive. Heterosexuals without risk of HIV have an infection rate of .02% What is the probability that a random person in this group would test positive?

  2. anonymous
    • 5 years ago
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    sorry it should say 99.8%

  3. anonymous
    • 5 years ago
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    I don't think this question has enough information.

  4. anonymous
    • 5 years ago
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    so, 99.8% of HIV positive patients test positive 1.5% who are non HIV positive still test positive and .02% of Heterosexuals are HIV positive What is the probability that a random person in this group would test positive?

  5. anonymous
    • 5 years ago
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    so sorry, I have never used this I will type in exactly what I have Regarding the Elias Test for HIV. Assume the test returns a positive result for 99.8% of those with the HIV virus and that when the test is given to those not infected it returns a positive result 1.5% of the time. Heterosexuals without specific risk factors for HIV have an infection rate of about .02%. What is the probability that a random person in this group would test positive?

  6. anonymous
    • 5 years ago
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    anybody got this?

  7. anonymous
    • 5 years ago
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    This is a conditional probability, you have to use bayes formula, also draw a tree diagram to make sense of the probabilities and its compliments

  8. anonymous
    • 5 years ago
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    not sure I know what you are talking about?

  9. anonymous
    • 5 years ago
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    I will have to check in later

  10. anonymous
    • 5 years ago
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    use Bayes formula of reverse probability ans will be 196/15193

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