Al-Obedy , J. A. N. (2026) “Using T Statistic for Shewhart and EWMA Control Charts for Monitoring Mean Process with Unknown the Process Standard Deviation”, Baghdad College of Economic Sciences University Journal (BCESUJ), 73(7), pp. 239–267. Available at: https://bcuj.baghdadcollege.edu.iq/index.php/BCESUJ/article/view/377 (Accessed: 13 October 2026).