HIV testing In July 2005 the journal Annals of InternalMedicine published a report on the reliability of HIVtesting. Results of a large study suggested that among people with HIV, 99.7% of tests conducted were (cor-rectly) positive, while for people without HIV 98.5% of the tests were (correctly) negative. A clinic serving anat-risk population offers free HIV testing, believing that15% of the patients may actually carry HIV. What’s theprobability that a patient testing negative is truly freeof HIV?

MATLAB: An Introduction with Applications
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Chapter1: Starting With Matlab
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HIV testing In July 2005 the journal Annals of Internal
Medicine published a report on the reliability of HIV
testing. Results of a large study suggested that among
people with HIV, 99.7% of tests conducted were (cor-
rectly) positive, while for people without HIV 98.5% of
the tests were (correctly) negative. A clinic serving an
at-risk population offers free HIV testing, believing that
15% of the patients may actually carry HIV. What’s the
probability that a patient testing negative is truly free
of HIV?
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