Chapter 5, Section 5.3, Question E40 A screening test for bureaucratic pomposity

Question

Chapter 5, Section 5.3, Question E40 A screening test for bureaucratic pomposity disorder (BPD) has reasonably good sensitivity and specificity, say 80% for both. (This means that, on average, eight out of every ten people who have BPD test positive and eight out of every ten who don't have BPD test negative.) Consider testing two different populations. a. Officiousville has a population of 1000. Half the people in Officiousville have BPD. Suppose everyone in Officiousville gets tested. Fill out the table below. Then use it to compute the PPV and NPV for this test. Test Result Positive Negative Total Present 500 DiseaseAbsent 500 Total 1000 Round the answers to two decimal places. PPV = NPV-

Explanation / Answer

from given information:

PPV =P(true positive)/P(total posiitve) =400/500 =0.80

NPV =true negative/ttal negative =400/500 =0.8

positive negative total present 400 100 500 absent 100 400 500 total 500 500 1000

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