C = 0 refers to an acceptance sampling plan where the acceptance number is zero. When samples are collected from the lot, observing any rejected items will cause the whole lot to be rejected. The C = 0 acceptance plans tend to need fewer samples than other acceptance plans. The offset for this is that lots are only reliably accepted when the defective levels are very close to 0.

Here, we will compare a previously defined plan, using Minitab, to tell us how the acceptance plan will behave. We can use the same tool to create an acceptance sampling plan and compare plans that we currently use. This can be useful to check the chance of acceptance or rejecting lots at different levels of quality. Changing the plan to a comparison also allows us to see the impact of using an acceptance level of 0.

The current plan inspects 230 samples and rejects the lot if any defectives are found. This is for an RQL or LTPD of 1 percent. No AQL is defined...