Proschan, F.; Savage, I. R. (1960, ASQC) Sylvania Electric Products Inc.; University of Minnesota
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The authors observe that the recommendations as to the number of subgroups needed to initiate a control chart for X-Bar are not fully in agreement. In this article, they determine how the level of significance is affected by the number of samples used to calculate the control limits.
Statistical process control (SPC)
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