When pollsters take a random sample of about 1000 people to estimate the mean of some quantity

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When pollsters take a random sample of about 1000 people to estimate the mean of some quantity over a population of millions of people, how is it possible for them to estimate the accuracy of the sample mean?
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Business Analytics Data Analysis and Decision Making

ISBN: 978-1305947542

6th edition

Authors: S. Christian Albright, Wayne L. Winston

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