When creating x and R charts, it is customary to measure a few observations at nearly the

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When creating x̅ and R charts, it is customary to measure a few observations at nearly the same time, such as 5 parts every 15 minutes. Each set of 5 parts is called a subsample. Why is it done this way? Why not just observe 1 part every 15 minutes?
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Business Analytics Data Analysis And Decision Making

ISBN: 1209

6th Edition

Authors: S. Christian Albright, Wayne L. Winston

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