An Application of Control Charts in Manufacturing Industry

Muhammad Riaz1 and Faqir Muhammad2

(QC 11)

Abstract

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. Mathematics Subject Classification: 97K40, 93E14, 93E10, 26E60

Keywords: Descriptive Statistics, Data Smoothing, Estimation and Detection, Mean