After reading this article you will learn about:- 1. Introduction to O.C. Curves 2. O.C. Curves for Single Sampling Plan 3. O.C. Curves for Double Sampling Plan 4. Zones. Introduction to O.C. Curves: O.C. curves quantifies manufacturer's (producer's) risk and consumer's (purchaser's) risk. This is a graph of the percentage defective in a lot versus the probability that the sampling [...]
After reading this article you will learn about frequency distribution and its use in controlling product quality. It is found that if production is carried on with proper care and accuracy then generally the resultant lot will be distributed in a so called normal pattern such as shown in plot 61.3. In this each product is arranged according to its [...]
After reading this article you will learn about the control charts for variables and attributes. Control Charts for Variables: A number of samples of component coming out of the process are taken over a period of time. Each sample must be taken at random and the size of sample is generally kept as 5 but 10 to 15 units can [...]