The following data summarizes results from 1000 pre-employment drug screening te

Question

The following data summarizes results from 1000 pre-employment drug screening tests. If one of the test subjects is randomly selected, find the probability that the subject had a positive test result or a negative test result.

P(subject had a positive test result or a negative test result) = _______ (Simplify your answer.)

Positive Test Result

Negative Test Result

Subject Uses Drugs

53

8

Subject Is Not a Drug User

853

P(subject had a positive test result or a negative test result) = _______ (Simplify your answer.)

Explanation / Answer

P(subject had a positive test result or a negative test result) = P(subject had a positive test result) + P(subject had a negative test result) - P(subject had a positive test result and a negative test result)

= (53 + 86)/1000 + (8 + 853)/1000 - 0

= 1 (ans)

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