4.2.21 Question Help * manjuana use, which is provided by a certain drug testing

Question

4.2.21 Question Help * manjuana use, which is provided by a certain drug testing company. Among 147 subjects with positive test results, there are 24 false positive results. Among 160 negative results, there are 4 false negative results. Complete parts (a) through (c) (Hint: Construct a table.) a. How many subjects were included in the study? The total number of subjects in the study was 307 b. How many subjects did not use marjuana? A total of 180 subjects did not use marijuana c. What is the probability that a randomly selected subject did not use manjuana? The probability that a randomly selected subject did not use marquana is (Do not round until the final answer Then round to three decimal places as needed )

Explanation / Answer

Total number of subjects do not use marijuana is

24+ 160-4= 180

Probability that a randomly selected subject didn't use marijuana

= Number of subjects didn't use marijuana/ Total number of subjects

=180/307

=0.5798

= 0.580 is the probability that a randomly selected subject didn't use marijuana.

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