Abstract
Many publications on statistical methods applied to engineering problems have been devoted primarily to the control of physical properties. Others have indicated roughly the degree of applicability to machine shop problems without going into the actual methods of establishing the system as a method of production control. The present paper has been written with a view to simplifying the mathematical aspects as far as possible by reducing them to arithmetical or graphical processes. A section is devoted to the limitations as well as the advantages of the various statistical methods, together with some discussion of the relation between drawing limits, control limits, and the measuring devices available. Emphasis is laid on the aspects of statistical control as an instrument of works administration rather than some new method of inspection. It may be applied only to appropriate problems with success. The influence of sample size on the interpretation of control charts is discussed.
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