A manager at a power company monitored the employee time required to process high-efficiency lamp bulb rebates.

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A manager at a power company monitored the employee time required to process high-efficiency lamp bulb rebates. A random sample of 40 applications gave a sample mean time of 3.8 minutes and a standard deviation of 1.2 minutes. Construct a point estimate for the population mean time to process, p, and give its 90% error margin.
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Statistics Principles And Methods

ISBN: 9780470904114

7th Edition

Authors: Richard A. Johnson, Gouri K. Bhattacharyya

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