Amazon.com is testing the use of drones to deliver packages for same-day delivery. In order to quote

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Amazon.com is testing the use of drones to deliver packages for same-day delivery. In order to quote narrow time windows, the variability in delivery times must be sufficiently small. Consider a sample of 24 drone deliveries with a sample variance of s= .81. 

a. Construct a 90% confidence interval estimate of the population variance for the drone delivery time. 

b. Construct a 90% confidence interval estimate of the population standard deviation.

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Statistics For Business & Economics

ISBN: 9781337901062

14th Edition

Authors: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran

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