CHAPTER 20
Control Charts
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
Most ...
Get Better Business Decisions from Data now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
