1. A screening test for bureaucratic pomposity disorder (BPD) has reasonably good sensitivity

and specificity, say 90% for both. (This means that, on average, nine 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 tests. Fill out a table to show how the test would

perform if you used it to screen Officiousville. Use it to compute PPV and NPV for this

test.

b. Mellowville has a population of 1000, but only 10 people in the whole town have BPD.

Fill out a table to show how the test would perform if you used it to screen Mellowville.

Use it to compute PPV and NPV for this test.