Consider the Probabilities of People Taking HIV Tests

question 44

Multiple Choice

Consider the probabilities of people taking HIV tests. Assume that the true probability of having HIV for all people who take the test is 3%. If HIV tests give a positive result in 99% of the cases in which the person has HIV and give a negative result in 99% of the cases in which the person does not have HIV, what is the probability that a person who gets a positive test result truly has HIV?

• A) 0.50
• B) 0.75
• C) 0.95
• D) 0.99

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