Create a 95 confidence interval for population proportion, Ask an Expert

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Q1) By measuring amount of time it takes component of the product to move from one workstation to next, an engineer has evaluated that standard deviation is 3.5 seconds.

(A) How many measurements must be made in order to be 99% certain that maximum error of estimation won't exceed 1 second?

(B) What sample size is needed for a maximum error of 2 seconds?

Q2) 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 determined that 1,143 were positive.

(a) Create a 95% confidence interval for population proportion of positive drug tests.

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

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