Question

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.

Answer 1

a. 0.047

b. Unlikely.

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.