Use the table below to answer the questions which follow. a) Find the probabilit

Question

Use the table below to answer the questions which follow. a) Find the probability of selecting someone who got a result that is a false negative. b) Find the probability of selecting someone who got a result that is false positive c) Find the probability of selecting someone who uses drugs. d) Find the probability of selecting someone who does not use drugs. e) If one of the test subjects is randomly selected, find the probability that the subject had a positive test result or a negative test result. f) If one of the test subjects is randomly selected, find the probability that the subject had a positive test result or does not use drugs. g) If one of the test subjects is randomly selected, find the probability that the subject had a negative test result or does not use drugs. h) If one of the test subjects is randomly selected, find the probability that the subject had a negative result or uses drugs.

Explanation / Answer

7.

a. probability of selecting someone who got a result false negative is 6/866
b. probability of selecting someone who got a result false positive is 90/134
c. probability of selecting someone who uses drugs is 50/1000
d. probability of selecting someone who do not uses drugs is 950/1000
e. one of the test is randomly selected,probability that the subject had a positive test or negative test is 134/1000 + 866/1000
f. one of the test is randomly selected,probability that the subject had a positive test or does not use drugs is 134/1000 + 950/1000
g. one of the test is randomly selected,probability that the subject had a negative test or does not use drugs is 866/1000 + 950/1000
h. one of the test is randomly selected,probability that the subject had a negative test or use drugs is 866/1000 + 50/1000

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