HIV It is estimated that in the United States, the proportion of people infected with the human immunodeficiency virus (HIV) is 0.00343. In tests for HIV, blood samples from 50 dif- ferent people are combined. What is the probability that the combined sample tests positive for HIV? Is it unlikely for such a combined sample to test positive?
Exercises 33 and 34 involve the method of composite sampling, whereby a medical testing laboratory saves time and money by combining blood samples for tests so that only one test is conducted for several people. A combined sample tests positive if at least one person has the disease. If a combined sample tests positive, then individual blood tests are used to identify the individual with the disease or disorder.
33. HIV It is estimated that in the United States, the proportion of people infected with the human immunodeficiency virus (HIV) is 0.00343. In tests for HIV, blood samples from 50 dif- ferent people are combined. What is the probability that the combined sample tests positive for HIV? Is it unlikely for such a combined sample to test positive?
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