The University of California at Berkeley Wellness Encyclopedia (1991) contains the following statement in its discussion of
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a. Suppose you have a friend who is part of this low- risk population but who has just tested positive. Using the numbers in the statement, calculate the probability that the person actu-ally carries the virus.
b. Your friend is understandably upset and doesn’t believe that the probability of being infected with HIV isn’t really near 1. After all, the test is accurate, and it came out positive. Explain to your friend how the Wellness Encyclopedia statement can be true, even though the test is very accurate both for people with HIV and for people who don’t carry it. If it’s easier, you can make up numbers to put in a table to sup-port your argument.
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