The purpose of this paper is to present a method which will enable the manager to make comparisons of the quality performance of a set of product lines so that the management's attention is concentrated where it is most needed. The comparison is usually difficult because the different lines may produce different specifications. The method proposed in this paper uses three Z values, which are described below.
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Holmes, D.S., and Mergen, A.E. (2000). "A Tool to Monitor Process", Istatistik, Journal of the Turkish Statistical Association, Vol. 3, No. 1-2, pp. 21-28.
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