) Suppose 50 drug test results are given from people who use drugs: Positive Test 44 Negative Test 6 Total Results: 50 If 2 of the 50 subjects are randomly selected without replacement, find the probability that the first person tested positive and the second person tested negative. P(________________________) = ________________________________________

4) Answer the remaining questions from the following table. Tested Positive for Marijuana Use Tested Negative for Marijuana Use Used Marijuana 119 3 Did Not Use Marijuana 24 154 a. If event A is a "false positive", what is P(A)? Answer: False positive: Did not use drug but tested positive. Total =119+3+24+154=300. P(A) = 24/300= 0.08=8% b. If event B is a "false negative" what is the P(B)? False negative: ________________________________________________ P(B) =________________________________________________________