For what percent of those tested for a certaininfection was the test accurate; that is, positive for those who had theinfection and negative for those who did not have the infection?
(1) Of those who testedpositive for the infection, 1/8 did not have theinfection.
(2) Ofthose tested for the infection, 90 percent tested negative.
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发表于 2013-11-2 23:32:52
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