A supplier ships a product in lots of size . We wish to have an AOQL of 3%, and we are going to use single-sampling. We do not know the supplier’s process fallout but suspect that it is at most 1% defective.

a. Find the appropriate Dodge-Romig plan.

b. Find the ATI for this plan, assuming that incoming lots are 1% defective.

c. Suppose that our estimate of the supplier’s process average is incorrect and that it is really 0.25% defective. What sampling plan should we have used? What reduction in ATI would have been realized if we had used the correct plan?

N = 8,000