Constructing χ2 Chart by Using Bayesian Approach with Application

In this study, new charts were formed using Baysian technique and they were called Baysian chart (2B) , to control the average . The control chart (2B) was used and the process includes real data that involved results of test of the asphalt concrete samples of the base layer used in the construction of new streets. These samples were obtained from the general authority of roads and bridges / The general directorate of roads and bridges in Nineveh province .