Читать книгу Paint Analysis - Roger Dietrich - Страница 28

No matter if a production failure or raw material consignment has to be tested, the analysis of the whole population is not an option. Therefore, a random sampling is necessary which guarantees that the sample represents the whole population with respect to the questioned parameters. This is called a representative sampling . But what is a representative sample and how to accomplish it? How big is big enough? In fact, there are two answers to these questions, a statistical and a practical answer. An example will be good to discuss the different aspects.