MEM 2221 Lecture Notes - Lecture 31: Probability Distribution, Poisson Distribution, Process Control
11 Dec 2019
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Chapter 12: chapter 12: managing production operations (cont) Statistics - gather, organizing, analysis and use of data. In quality control statistical methods are used to evaluate a qualitative characteristic. Variables methods - measuring the qualitative characteristic on a sample of the item being controlled, then using a continuous probability distribution such as the normal distribution for analysis. Range = difference between the highest and lowest levels. Attributes methods - counting items that do not fall within a stated specification as defective and using the fraction defective in a sample in discrete probability distributions such as binomial or poisson for analysis. Measure of central tendency - average x = n n. Measure of dispersion - spread, standard deviation. V = 1 n n 1 j=1 j x 2 (x. Process control - process continues to produce items with unchanged quality characteristics. Process control charts - used to call potential problems to attention.
