THE DESIGNING AND SELECTION OF MIXED MODIFIED CHAIN SAMPLING PLAN WITH VARIANCE CRITERION

Mean is the most commonly used criterion in acceptance sampling inspection by variables, but in many cases, where the variance of the quality characteristics is used as the criterion. Here, a lot may be accepted, if the variance of the quality characteristics is less than or equal to a pre-specified maximum (σo2) value. This paper deals with the new algorithm of Mixed Sampling Plans with Variance criterion. Modified Chain Sampling plan is used in the second stage of mixed plans The Operating Characteristic function and other associated measures of the plan are provided. The algorithm and designing of mixed sampling plan are indexed through standard quality levels. Tables are constructed for easy selection of the plan. Illustrations are also provided.