June 2014
Beginner to intermediate
288 pages
7h 2m
English
Content preview from Better Business Decisions from Data
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CHAPTER 20
Control Charts
Navigating around the Factory
Quality control procedures are used in production processes to ensure that the products continue to meet the appropriate specifications. Usually, periodic sampling of the products is employed; and control charts, sometimes referred to as Shewhart charts, are used to record the results in order to anticipate the onset of problems in the production processes.
Two types of chart are in use, the choice depending on how the product is checked. If it is checked by a numerical measurement, the process is referred to as sampling by variable. If it is checked by observation of satisfactory or unsatisfactory features, the process is referred to as sampling by attribute.
Sampling by Variable
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