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Unformatted text preview: exactly trapped or cut in the precise shape as the nature of the material has a slight stretch in it. 8.62 In 1992, the FAA conducted 86,991 preemployment drug tests on job applicants who were to be engaged in safety and securityrelated jobs, and found that 1,143 were positive. phat = 1143/86991 = 0.013139 sigma = sqrt[p'q'/n'] = sqrt[0.013*0.0.987/86991]= 0.000384 (a) Construct a 95 percent confidence interval for the population proportion of positive drug tests. E = 1.96*0.000384 = 0.000753 95% C.I.: 0.0130.000753 < p < 0.013 + 0.000753 95% C.I.: 0.0122 < p < 0.013763...
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