质量控制基础之oc曲线(编辑修改稿)

质量控制基础之oc曲线(编辑修改稿)内容摘要：

Properties of OC Curves • By changing the acceptance level, the shape of the curve will change. All curves permit the same fraction of sample to be nonconforming. Example Uses • A pany that produces push rods for engines in cars. • A powdered metal pany that need to test the strength of the product when the product es out of the kiln. • The accuracy of the size of bushings. Problem • MRC is an engine pany that builds the engines for GCF cars. They are use a control policy of inspecting 15% of ining lots and rejects lots with a fraction defect greater than 3%. Find the probability of accepting the following lots: Problem 1. A lot size of 300 of which 5 are defective. 2. A lot size of 1000 of which 4 are defective. 3. A lot size of 2500 of which 9 are defective. 4. Use Poisson formula to find the answer to number 2. Summary • Types of OC curves – Type A, Type B, Type C • Constructing OC curves • Properties of OC Curves • OC Curve Uses • Calculation of an OC Curve Poisson Table dnp 0 1 2 3 4 5 6 7 8 9 100 . 0 2 980 10000 . 0 4 961 999 10000 . 0 6 942 998 10000 . 0 8 923 997 10000 . 1 905 995 10000 . 1 5 861 990 999 10000 . 2 819 982 999 10000 . 2 5 779 974 998 10000 . 3 741 963 996 10000 . 3 5 705 951 994 10000 . 4 670 938 992 999 10000 . 4 5 638。