ana use, which is provided by a certain drug testing company. Among 140 subjects

Question

ana use, which is provided by a certain drug testing company. Among 140 subjects with positive test results, there are 29 false positive results; among 151 negative results, there are 3 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. (Hint Construct a table.) The probability that a randomly selected subject tested negative or did not use marjuana is (Do not round until the final answer. Then round to three decimal places as needed.) Enter your answer in the answer box

Explanation / Answer

Construct the table as follows.

False positive is when in reality it is false, but you test them as true. The upper right cell (29)

False negative is when in reality it is true, but you test them as false. The lower left cell (3)

totally there are 291 subjects.

Out of which 151 are tested negative.

The probability that a randomly selected subject tested negative or did not use marijuana is 151 out of 291

0.5189

i.e. 51.89%

Real TRUE FALSE Tested TRUE 111 29 140 FALSE 3 148 151 114 177

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.