A test for marijuana usage was tried on 170 subjects who did not use marijuana. The test result was wrong 8 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.

Question

Sharon Douglas

Mathematics

26 September, 08:38

A test for marijuana usage was tried on 170 subjects who did not use marijuana. The test result was wrong 8 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.

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Billie · Answer 1

a. 0.047

b. Unlikely.

Step-by-step explanation:

a. The probability of a test result being wrong for a person not using mrijuana = 8 / 170 = 0.047.

b. As the probability for a wrong result is < 0.05 we can say that the test is unlikely to be wrong.