# Confidence Interval for the Proportion

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A new voice mail system is installed. After 2 hours of training, employees are expected to be able to compose and send a message to a distribution list. Three days later, 30 employeess are asked to demonstrate this procedure. Of the 30 sampled, 7 successfully composed and send a message. If these thirty represent a random sample of employees, what is the 99% interval estimation for the percent of employees who can successfully compose and send a message to a distribution list.

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The solution provides explanations how to find out the confidence interval for the proportions.

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The critical z value for 99% confidence interval ...

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