Problem 23BSC
In Exercises, refer to Table, included with the Chapter Problem. In each case, assume that 1 of the 1000 test subjects is randomly selected.
Positive Predictive Value Find the positive predictive value for the test. That is, find the probability that a subject uses drugs, given that the test yields a positive result.
Table PreEmployment Drug Screening Results

Positive Test Result (Drug Use Is Indicated) 
Negative Test Result (Drug Use Is Not Indicated) 
Subject Uses Drugs 
44 (True Positive) 
6 (False Negative) 
Subject Is Not a Drug User 
90 (False Positive) 
860 (True Negative) 
Solution 23BSC
= 0.328