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editThe following source was presented by Assem Khidhr, who suggested this redirect at WP:AFC/R:
Mean (x-Bar) Charts:
A mean control chart is often referred to as an x-bar chart. It is used to monitor changes in the mean of a process. To construct a mean chart, we first need to construct the center line of the chart.— Reid, Robert Dan; Sanders, Nada R. (2019). Operations Management: an integrated approach. Hoboken, NJ: John Wiley & Sons, Inc. p. 204. ISBN 9781118122679.