|
Abstract:
|
The “95/95 criterion” has been used to demonstrate at a 95% confidence level that more than 95% of the tested products meet a success standard. Under this criterion, a binomial method is typically applied which requires testing 60 products with no failures allowed for monthly quality control (QC), or testing 93 products with one failure allowed. A scan statistics method with a moving testing window is recommended by some researchers because its helps to detect cluster of events. Compared to the binomial method, a smaller sample size is required by the scan statistics method in general. In our previous research, we compared the Type I error rate and power of these two approaches (binomial and scan) of various sampling schemes via simulations. In this research, hypergeometric method is included in the comparison. We add the factor of manufacturing size into considerations. Recommendations are given regarding the method selection.
|
