Refer to the sample data for? pre-employment drug screening shown below. If one
ID: 3375343 • Letter: R
Question
Refer to the sample data for? pre-employment drug screening shown below. If one of the subjects is randomly? selected, what is the probability that the test result is a false? positive? Who would suffer from a false positive? result? Why?
?Pre-Employment Drug Screening Results
Positive test result
Negative test result
Drug Use Is Indicated
Drug Use Is Not Indicated
Subject Uses Drugs
42
10
Subject Is Not a Drug User
15
30
?Pre-Employment Drug Screening Results
Positive test result
Negative test result
Drug Use Is Indicated
Drug Use Is Not Indicated
Subject Uses Drugs
42
10
Subject Is Not a Drug User
15
30
Explanation / Answer
P(Test results is a false positive)
= P(Positive test results when subject is not a drug user)
= 15/(15 + 30)
= 15/45
= 1/3
The person tested would suffer because he/ she would be accused of taking drugs when in fact, he isn't.
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