A test is used to screen people for hepatitis B. The sensitivity of the test is 95% and the specificity of the test is 90%. Assume that the total number of persons being tested for hepatitis B is 50,000. Assume that the true prevalence of hepatitis B in the population is 100 per 50,000. Disease present Disease absent Positive test a- true positive b- false positive Negative test C- false negative d= true negative 1) Calculate the number of true positives 2) Calculate the number of false positives

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