Asked by Stuart
                When the purpose of sampling is to detect when a process becomes too variable, the chart of choice will be an R chart. 
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Answers
                    Answered by
            PsyDAG
            
    Since this is not my area of expertise, I searched Google under the key words "<I>R chart</I>" to get these possible sources:
http://en.wikipedia.org/wiki/XbarR_chart
http://www.qualityamerica.com/knowledgecente/knowctrInterpreting_an_Xbar_R_Chart.htm
http://www.java4less.com/charts_e.htm
http://www.itl.nist.gov/div898/software/dataplot/refman1/ch2/r_chart.pdf
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.
    
http://en.wikipedia.org/wiki/XbarR_chart
http://www.qualityamerica.com/knowledgecente/knowctrInterpreting_an_Xbar_R_Chart.htm
http://www.java4less.com/charts_e.htm
http://www.itl.nist.gov/div898/software/dataplot/refman1/ch2/r_chart.pdf
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.
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