MIXED VARIABLES AND ATTRIBUTES PLAN :THE EXPONENTIONAL CASE Abstract The mixed variables –attributes test plans for single acceptance sampling are proposed to protect “good lots from” attributes aspect and to optimize sample sizes from variables aspect. For the single and double mixed plans, exact formulas of the operating characteristic and average sample number are developed for exponential distribution. Numerical illustration show that the mixed sampling plan have some advantages over the variables plan or attributes plan alone. Introduction A lot by lot sampling inspection plan is basis for action. The desired action depends on the defective in the lot. For instance , if there are “few” defectives, the author wishes to use the lot and if there are “many” defectives, then rework...
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