X Bar Chart. The mean of the first subgroup of 232 242 236 229 220 2318 The centerline represents the average of all the 10 subgroup averages 2295 The Upper Control Limit UCL 3 sigma above the center line 23769. Oct 13 2019 x-bar chart.
The X-bar chart monitors the process location over time based on the average of a series of observations called a subgroup. The range chart examines the variation within a subgroup. Oct 13 2019 x-bar chart.
The range chart examines the variation within a subgroup.
Its utilized to monitor the process mean when calculating subgroups at regular intervals from a process. The R-chart was preferred in times when calculations were performed. The X-Bar chart shows how much variation exists in the process over time. The x-bar and R-chart are quality control charts used to monitor the mean and variation of a process based on samples taken in a given time.
