BU275 Final: BU-375-NOTES-3-4
Document Summary
Statistical process control: statistical quality (process) control. Use of statistical technologies and sampling in monitoring and testing the quality of goods or services provided for consumers. It is concerned with the statistical evaluation of the product in the production process. If the sample falls outside of the limit, then the process stops; if not, then it continues: all processes contain a certain amount of variability that makes some variation between units inevitable. There are two reasons why a process might vary: random variation. The first is the inherent random variability of the process, which depends on the equipment and machinery, the engineering, the operator, and the system used for measurement. This kind of variability is a result of natural occurrences: non-random (special or assignable variation) The other reason for variability is unique or special causes that are identifiable and can be corrected. These causes tend to be non-random and, if left unattended, will cause poor quality.
