Hawkar Qasim Birdawod., Dashty Ismil Jamil و Dlshad Mahmood Saleh 2021. Comparison of Efficiency and Sensitively between (Three Sigma, Six Sigma and Median Absolute Deviation) by using Xbar Control Chart. QALAAI ZANIST JOURNAL. 3, 2 (2021), 803–812. DOI:https://doi.org/10.25212/lfu.qzj.3.2.33.