Acceptance sampling is a quality control process used to determine if a sample of items meets certain standards, and whether to accept or reject the full lot. It helps balance the risks of accepting low quality products (consumer risk) versus rejecting high quality products (producer risk). Acceptance sampling can be applied at input, output, or process stages to monitor quality and make adjustments. A typical plan involves setting sample size, acceptance number, and deciding whether to accept or reject the full lot based on comparing defective items found to the acceptance number.

1. ACCEPTANCE SAMPLING Er.Sartaj.Singh.Bajwa

2. Acceptance Sampling Defined Acceptance Sampling is a form of inspection that is used to determine whether or not goods are coherent with a set standard of quality Er.Sartaj.Singh.Bajwa

3. Acceptance Sampling Acceptance sampling is a process that helps to determine whether to accept or reject the sample being observed Er.Sartaj.Singh.Bajwa

4. Risks of Acceptance Sampling Producers Risk The risk associated with a producer rejecting a lot of materials that actually have good quality Also referred to as a Type I Error or ( α ) Er.Sartaj.Singh.Bajwa

5. Risks of Acceptance Sampling Consumers Risk The risk associated with a consumer accepting a lot of materials that actually have poor quality Also referred to as a Type II Error or ( β ) Er.Sartaj.Singh.Bajwa

6. When can acceptance sampling be applied? At any point in production The output of one stage is the input of the next Er.Sartaj.Singh.Bajwa

7. When can acceptance sampling be applied? Sampling at the Input stage Prevents goods that don’t meet standards from entering into the process This saves rework time and money Er.Sartaj.Singh.Bajwa

8. When can acceptance sampling be applied? Sampling at the Output stage Can reduce the risk of bad quality being passed on from the process to a consumer This can prevent the loss of prestige, customers, and money Er.Sartaj.Singh.Bajwa

9. When can acceptance sampling be applied? Sampling at the Process stage Can help adjust the process and reduce the amount of poor quality in production Helps to determine the source of bad production and enables return for reprocessing before any further costs may be incurred Er.Sartaj.Singh.Bajwa

10. Typical Application of Acceptance Sampling Based on the observations made, the decision is made to either accept or reject the entire shipment Er.Sartaj.Singh.Bajwa

11. Typical Application of Acceptance Sampling The decision to accept or reject the shipment is based on the following set standards: Lot size = N Sample size = n Acceptance number = c Defective items = d If d <= c, accept lot If d > c, reject lot Er.Sartaj.Singh.Bajwa

12. Acceptance Sampling Plan Mr. Smith owns and operates a manufacturing plant. He receives a shipment of 1,000 sheets of glass. Of the shipment, Mr. Smith chooses to sample 50 sheets. Er.Sartaj.Singh.Bajwa

13. Acceptance Sampling Plan If more than 2 are defective, he is sending back the entire shipment to the supplier. Mr. Smith observes 5 defective sheets of glass. Er.Sartaj.Singh.Bajwa

14. Acceptance Sampling Plan Therefore, according to the set standards mentioned above: N = 1,000 n = 50 c = 2 d = 5 Er.Sartaj.Singh.Bajwa

15. Acceptance Sampling Plan What should Mr. Smith do in reference to the number of defective items observed???? Er.Sartaj.Singh.Bajwa

16. Acceptance Sampling Plan Remember, if d > c, reject lot Since c = 2, and d = 5… Mr. Smith should reject the lot of 1,000 sheets of glass Er.Sartaj.Singh.Bajwa