4.2.33 A test for marijuana usage was tried on 237 subjects who did not use mari

Question

4.2.33 A test for marijuana usage was tried on 237 subjects who did not use marijuana. The test result was wrong 2 times. a. Based on the available results, find the probability of a wrong test result for a person who does not use marijuana. b. Is it "unlikely" for the test to be wrong for those not using marijuana? Consider an event to be unlikely if its probability is less than or equal to 0.05. a. The probability that the test will be wrong is approximately (Type an integer or decimal rounded to three decimal places as needed.)

Explanation / Answer

Solution

(a) The probability that the test will be wrong = 2/237

So required probability = 0.008

(b) Yes the event is unlikely as 0.008<0.05

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