A GROUP ACCEPTANCE SAMPLING PLANS FOR TRUNCATED LIFE TESTS BASED ON THE INVERSE RAYLEIGH AND LOG-LOGISTIC DISTRIBUTIONS

Abstract

A group acceptance sampling plan from a truncated life test is designed when the lifetime of an item follows either an inverse Rayleigh or a log-logistic distribution, in which a multiple number of items as a group can be tested simultaneously in a tester. The minimum number of groups required for a given group size and the acceptance number is determined when the consumer's risk and the test termination time are specified. The operating characteristic values according to various quality levels are found and the minimum ratios of the true average life to the specified life at the specified producer's risk are obtained. Some comparisons are made between the results for the two distributions. The results are explained with tables.