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    Confidence Interval for a Population Proportion

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    In 1992, the FAA conducted 86,991 pre-employment drug tests 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 percent 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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    Solution Summary

    Step-by-step determination of the confidence interval. The other question is also answered.