Exam 23: Acceptance Sampling Plans

An operating characteristic curve is a plot of the probability of accepting the lot against the proportion defectives.

This OC curve represents a sampling plan developed for a lot size of 1000,a sample size of 15,and an acceptance number of 2.The probability of acceptance for each of the first six points appears next to the plotted point.What is the average outgoing quality for an incoming fraction defective of 0.25?

The AOQ is often lower for a supplier with a high fraction defective than for a supplier with a comparatively lower fraction defective.Why wouldn't a supplier with a lower fraction defective always have a better AOQ?

________ is an inspection procedure used to determine whether to accept or reject a specific quantity of material.

________ is the risk that the sampling plan will fail to verify an acceptable lot's quality and thus reject it-a type I error.

An item is purchased with one surface polished to a specified finish quality.From each incoming shipment,a sample of items is randomly selected and the polished surface of each sample item is compared with a standard and judged to be either acceptable or unacceptable.The following parameters have been established: AQL = 0.02,= 0.05,LTPD = 0.09,and = 0.10.Table G.1 is appended to this exam.What are the sample size and the acceptance number?

TABLE G.1 Cumulative Poisson Probabilities -A single-sampling plan by attributes is needed for a purchased component.Table G.1 is appended to this exam. Sample size = 80 Acceptance number (c)= 1 Acceptance quality level (AQL)= 0.02 Lot tolerance proportion defective (LTPD)= 0.06 Given the preceding information draw the AOQ curve and determine the AOQL.

The lot tolerance proportion defective (LTPD)is the customer's desired level of quality.