Dolon Web Security Consultants requires all job applicants to submit to a test for illegal drugs. If the applicant has used illegal drugs, the test has a 90 percent chance of a positive result. If the applicant has not used illegal drugs, the test has an 85 percent chance of a negative result. Actually, 4 percent of the job applicants have used illegal drugs. If an applicant has a positive test, what is the probability that he or she has actually used illegal drugs? Hint: Make a 2 × 2 contingency table of frequencies, assuming 500 job applicants.
Answer to relevant QuestionsWhich of the following could not be probability distributions? Explain. Historically, 5 percent of a mail-order firm's regular charge-account customers have an incorrect current address in the firm's computer database. (a) What is the expected number of customer orders until the first one with ...A certain outpatient medical procedure has five steps that must be performed in sequence. (a) Assuming that the time (in minutes) required for each step is an independent random variable, find the mean and standard deviation ...Calculate each compound event probability: a. X < 3, n = 8, = .20 b. X < .7, n = 10, = .50 c. X < 3, n = 6, = .70 There is a 70 percent chance that an airline passenger will check bags. In the next 16 passengers that check in for their fight at Denver International Airport, find the probability that (a) All will check bags; (b) Fewer ...
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