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In 1992, the FAA conducted 86,991 pre-employment drug tests on the job applicants who were to be engaged in the safety and security-related jobs, and found that 1,143 were positive.

a) Make a 95 percent confidence interval for population proportion of positive drug tests.

b) Why is the normality assumption not the problem, despite the very small value of p?

Statistics and Probability, Statistics

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