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Solved: In Exercises, refer to Table, included with the Chapter Problem. In each case

Chapter 4, Problem 21BSC

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QUESTION:

Problem 21BSC

 

In Exercises, refer to Table, included with the Chapter Problem. In each case, assume that 1 of the 1000 test subjects is randomly selected.

Table Pre-Employment 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)

Inverse Probabilities Find P (subject uses drugs | negative test result). Compare this result to the result found in Exercise. Are P (subject uses drugs | negative test result) and P (negative test result | subject uses drugs) equal?

Exercise

False Negative Find the probability of selecting a subject with a negative test result, given that the subject uses drugs. Who would suffer from this type of error?

Questions & Answers

QUESTION:

Problem 21BSC

 

In Exercises, refer to Table, included with the Chapter Problem. In each case, assume that 1 of the 1000 test subjects is randomly selected.

Table Pre-Employment 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)

Inverse Probabilities Find P (subject uses drugs | negative test result). Compare this result to the result found in Exercise. Are P (subject uses drugs | negative test result) and P (negative test result | subject uses drugs) equal?

Exercise

False Negative Find the probability of selecting a subject with a negative test result, given that the subject uses drugs. Who would suffer from this type of error?

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