In 1992 faa conducted 86991 pre-employment drug tests on, Ask an Expert

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Confidence interval for population proportion.

In 1992, 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, in spite of the very small value of p?

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