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