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Suppose that a polygraph...

Suppose that a polygraph is 90% accurate (it will correctly detect 90% of people who are lying and it will correctly detect 90% of people who are telling the truth). The 1 comma 960 employees of a company are given a polygraph test during which they are asked whether they use drugs. Assume that anyone whom the polygraph operator finds untruthful is accused of lying. Complete parts (a) and (b).

Users

Nonusers

Total

Test finds employee lying

18

194

212

Test finds employee truthful

2

1 comma 746

1 comma 748

Total

20

1 comma 940

1 comma 960

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