X Bar Chart Minitab. None of the points are outside the control limits and the points display a random pattern. No points are out of control and all the points fall within the control limits in a random pattern.
Use Xbar Chart to monitor the mean of your process when you have continuous data in subgroups. The R charts for all three machines show that the process variation is in control. The engineer looks at the R chart first because if the R chart shows that the process variation is not in control then the control limits on the Xbar chart are inaccurate.
The center line is the average of all subgroup averages.
Use this control chart to monitor process stability over time so that you can identify and correct instabilities in a process. One points fails test 1 one point more than 3 standard deviations from center line on Xbar chart. The data points are. Dont forget to subscribe and share.
