An x-bar chart is a statistical device used for the study and control of a process. Control charts based on the three … collected from a petroleum company in Kuwait to produce an x-bar chart. Unfortunately, it seems there are some serious …

among the observations of the weights of tablets of a pharmaceutical industry by using modified X -bar chart. Design …/methodology/approach – The design of the modified X -bar chart is based upon the sum of χ 2s, using warning limits and the performance of the … modified X -bar chart is computed for sample sizes of four. ARLs of optimal schemes of X -bar chart for sample size of four are …