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Thirty samples of size 4 resulted in an overall mean of 16.90 and an average range of 1.63. Compute control limits for x?- and R-charts.
Thirty samples of size 4 resulted in an overall mean of 16.90 and an average range of 1.63. Compute control limits for x?- and R-charts. Use the control chart factors in Appendix B to answer the ques
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