Use the following results from a test for marijuana use, which is provided by a

Question

Use the following results from a test for marijuana use, which is provided by a certain drug testing company. Among 144 subjects with positive test results, there are 26 false positive results: among 154 negative results, there are 5 false negative results. If one of the test subjects is randomly selected, find the probability that the subject tested negative or did not use marijuana. The probability that a randomly selected subject tested negative or did not use marijuana is (Do not round until the final answer. Then round to three decimal places as needed.)

Explanation / Answer

Answer:

Test

Positive

Negative

use

118

5

123

Not use

26

149

175

144

154

298

P = (154+26)/298 = 0.604027

= 0.604   ( rounded to 3 decimals)

Test

Positive

Negative

use

118

5

123

Not use

26

149

175

144

154

298

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