SAMPLING

摘要

What is sampling? In the manufacturing process, many measures are taken on the basis of data. Before taking any action concerning quality control, it is absolutely necessary to compile data. For example, data are necessary to control process parameters like humidity, temperature, pressure etc. Data are also necessary to control the characteristics of the products such as weight, dimensions, physical properties etc. Finally, efficiency, yield, fraction defectives, and cost can be termed as data. These data describe the process status of a product, not the quality of the lot.