Use the folowing results from a test for marjuana use, which is provised by a ce

Question

Use the folowing results from a test for marjuana use, which is provised by a certain drug testing company Among 142 subijects with positive test results, there are 20 false postive resuts among 154 negaive bjects is randomly selected, Ind the probability that the subject tested negative or did not use marjuana. (Hint: Construct a table) The probability that a randomly selected subject tested negative or did not use manijuana is (Do not round until the final answer. Then round to three decimal places as needed )

Explanation / Answer

Ans:

P(negative or did not use)=P(negative)+P(did not use)-P(negative and did not use)

=(154/296)+(171/296)-(151/296)

=(154+171-151)/296

=174/296=0.588

Use did not use Total Positive 122 20 142 Negative 3 151 154 Total 125 171 296

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