www.tjprc.org SCOPUS Indexed Journal editor@tjprc.org MIXED TWO SIDED COMPLETE CHAIN SAMPLING PLANS FOR MAXIMUM ALLOWABLE VARIANCE K. REBECCA JEBASEELI EDNA & V. JEMMY JOYCE Department of Mathematics, Karunya Institute of Technology and Sciences (Deemed to be University), Coimbatore, Tamil Nadu, India ABSTRACT In acceptance sampling plans, mean is commonly used for variable inspection in the production field. In some situations, the variance of the quality characteristics is used as the criterion. That is, a lot may be accepted, if the variance of the quality characteristics is less than or equal to a pre-specified maximum (σ o 2 ) value. In this paper, the operating procedure of Mixed Acceptance Sampling Plans with Maximum Allowable Variance is developed. Two-Sided Complete Chain Sampling plan are used in the second stage of mixed plans The Operating Characteristic function and other associated measures of the plan are given. The algorithm and designing of the mixed sampling plan is indexed through AQL and LQL. Tables are constructed for easy selection of the plan. An example is also provided. KEYWORDS: Mixed Sampling, OC (operating characteristic) function, AQL(Acceptable Quality Level), LQL (Limiting Quality Level) I stage Sampling & II stage Sampling Received: Apr 06, 2018; Accepted: Apr 26, 2018; Published: May 22, 2018; Paper Id.: IJMPERDJUN201864 INTRODUCTION Mixed Sampling Plan was introduced by Dodge and later Schilling (1967) has given a procedure to find the OC function and its associated measures. Mixed Sampling Plan has two stages. The first stage is based on variable criteria and the second stage with attribute quality characteristics. In a Mixed Sampling Plans, the second stage of attribute inspection becomes more important to discriminate the lot, if the first stage variable inspection fails to accept the lot. In the second stage, acceptance number of zero plans is more significant for a practical reason. Therefore, two-sided complete chain sampling plans are used in the second stage. The resulting plans yield small samples in both the stages. Clark. C. R (1955), Frishman and Fred (1960), Dodge. H. F and Stephens K. S (1966), Kuralmani. V and Govindaraju. K (1993) contributed more to chain sampling plan. Suresh and Deva Arul (2002) have developed mixed sampling plans by combining process and product quality characteristics to reduce the sampling cost… Suresh and DevaArul (2003) have developed mixed sampling plans for Maximum Allowable Variance. FORMULATION AND OPERATING PROCEDURE OF MIXED PLAN WITH VARIANCE CRITERION The development of mixed plans and the subsequent discussions are limited only to the known variance (σ 2 ). The mixed sampling plan with variance criterion can be formulated with four parameters n 1 , n 2 , k’, c. For predetermined values of the parameters, an independent plan with known variance would be carried out as follows: Original Article International Journal of Mechanical and Production Engineering Research and Development (IJMPERD) ISSN (P): 2249-6890; ISSN (E): 2249-8001 Vol. 8, Issue 3, Jun 2018, 599-602 © TJPRC Pvt. Ltd