Sulla dimensione ottimale del campione nel controllo statistico di qualità, per variabili,dei prodotti industriali in corso di lavorazione

The statistical quality control for variables, during production, is done—as is known—by a sistematic selection of samples, drawn at regular time intervals from the production flow. To optimize the two parameters of the sampling plan, viz. sample size and time interval, is known a problem of marked interest both from the theoretical and the practical point of view. This paper deals with the research of optimum solutions in practical applications. In order to simplify calculations, necessary in the varions cases, the tables of the Appendice have been prepared: each table refers to a specific sample size (n=2,3,4,5,6,8,10,12,16).