A supplier wants to design a sampling plan for his customer. The supplier estimated the fraction

non-conforming based on the data collected from his manufacturing records is 2%, and the

customer is willing to accept maximum of 4% fraction non-conforming products in the lot. The

supplier has an agreement to use a sample of 80 products from the lot of 1000 products. (a) Draw

the OC curve of the sampling plan assuming that the lot will be accepted if the number of defective

products in the sample is at best 1. (b) Do you think that the sampling plan will provide a

reasonable protection for the supplier? (c) To improve the probability of acceptance of the lot, the

supplier wants to apply rectifying inspection plan on the in-coming lot. Do you think inspection

plan will help to improve the quality level of the out-going lot?-Answer with evidence. (d)

Estimate the average total inspection required by the rectifying inspection plan used in (c).

Solution:

topic ( Quality Control)