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    Statistics - Confidence Interval

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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% 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 ?

    (Data are from Flying 120, no. 11 [November, 1993], p. 31)

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