[Journal:] Journal of Statistical and Econometric Methods [ISSN:] 2241-0376 [Volume:] 1 [Year:] 2012 [Issue:] 1 [Pages:] 77-92
The range control chart and the X bar control chart are the well known and the most popular tools for detecting out- of-control signals in the Statistical Quality Control (SQC). The control charts has shown his worth in the manufacturing industry. In this study we have applied the range and the X bar control charts to a product of Swat Pharmaceutical Company. The variables under study were weight/ml, Ph, Citrate % and the amount of fill. Besides the X bar control chart, the exponentially weighted moving average control chart and the multivariate Hotelling's T2 control chart were applied to the same data.
descriptive statistics data smoothing estimation and detection mean