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 _129 subjects with positive test results, mere are 22 false positive results. Among 153 negative results, there are 3 raise negative results. Complete parts (a) through (c). a. How many subjects were included in the study? The total number of subjects in the study was ___ b. How many subjects did not use marijuana? A total or ___ subjects did not use marijuana c. What is the probability that a randomly selected subject did not use marijuana? The probability that a randomly selected subject did not use marijuana is ___

Explanation / Answer

a) The total number of subjects in the study = 129+153 = 282

b) Among 129 subjects tested positive there are 22 false positive results.

Among 153 subjects tested negetive there are 3 false negetive results.

Therefore the total number of subjects who did not use marijuana = 22+(153-3) = 172

c) The probability that a randomly selected subject did not use marijuana = 172/282 = 0.6099

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