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    Statistics - Confidence Interval

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    In 1992, the FAA conducted 86,991 pre-employment drug test on job applicants who were to be engaged in safety and security-related jobs, and found that 1,143 were positive. A)Construct a 95% confidence interval for the population proportion of positive drug tests. B)Why is the normality assumption not a problem, despite the very small value of p?

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