Before revision: ==== Low-prevalence population ==== Numberof people Infected Uninfected Total Testpositive 20(true positive) 49(false positive) 69 Testnegative 0(false negative) 931(true negative) 931 Total 20 980 1000 Now consider the same test applied to population B, of which only 2% are infected.
After revision: Low-prevalence population Numberof people Infected Uninfected Total Testpositive 20(true positive) 49(false positive) 69 Testnegative 0(false negative) 931(true negative) 931 Total 20 980 1000 Now consider the same test applied to population B, of which only 2% are infected.