Positive Test Result Negative Test Result (Test shows drug use.) (Test shows no drug use.) 45 5 The subject uses drugs. (True Positive) (False Negative) The subject does not use 25 480 drugs. (False Positive) (True Negative)Assume that 1 of the 555 subjects is randOmly selected. 1. Find the probability of selecting someone who got a false negative result Who would suffer from a false negative result? Why? 2. Find the probability of selecting someone who got a false-positive result. Who would suffer from a false positive result? Why? 3. Find the probability of selecting someone who uses drugs. Does the result appear to be reasonable to estimate the "prevalence rate"? 4. Find the probability of selecting someone who does not use drugs. Does the result appear to be reasonable to estimate the proportion of the adult population that does not use drugs? 5. Find the probability of selecting a subject with a positive test result or using drugs. 6. Find the test sensitivity. 7. Find the test specicity. Let's deal with the 50 test results from the subjects who use drugs. 8. If 2 of these 50 subjects who use drugs are randomly selected with replacement, find the probability that the rst selected person had a positive test result. The second person chosen had a negative test result. 9. Repeat the process in Item 8 by assuming that the two subjects are selected without replacement