The range of a small set of measurements has traditionally been used as a measure of variability

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The range of a small set of measurements has traditionally been used as a measure of variability for x̅ and R charts. Why isn't standard deviation used instead? And why are two charts necessary, an x̅ chart and an R chart?

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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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Question Posted: Apr 06, 2017 11:50 AM

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The range of a small set of measurements has traditionally been used as a measure of variability

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The range is used rather than the standard deviation for the simple reason that it is easier ...View the full answer

Business Analytics Data Analysis and Decision Making

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