Minitab determines an appropriate sampling plan.

From the lot of 3,600 lenses, the manufacturer and supplier agree to set the acceptable quality level (AQL) to 100 defectives per million and the rejectable quality level (RQL) to 600 defectives per million with respect to the customer's thickness specifications of 0.395-0.415. Using a producer's risk (alpha) of 0.05 and a consumer's risk of 0.10, Minitab determines that an appropriate sampling plan is to randomly select and measure 259 of the 3,600 lenses and compare the data against a critical distance of 3.44914.