Construction and Selection of Tightened-Normal-Tightened Schemes of Type TNT-(n 1 , n 2 ; c) indexed through Six Sigma Quality Levels

Abstract

“Six Sigma is a tool used to convert management problem into a statistical problem and to find a statistical solution then convert it to a management solution”. Six Sigma is a set of practices originally developed by Motorola to systematically improve processes by eliminating defects. In particular processes that operate with Six Sigma quality initiatives produce 3.4 defects or below per (one) million opportunities (dpmo). In this paper a new procedure for the construction and selection of Tightened-Normal-Tightened sampling scheme of type TNT-(n1, n2; c) indexed through Six Sigma Quality Level-1(SSQL-1) and Six Sigma Quality Level-2 (SSQL-2) are presented. Tables are also constructed and presented for the easy selection of the plans.

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