How to change the control limits on x-bar chart


Discuss the below:

Questions:

What happened at different times during this shift?

Why did management change the UCL in the R chart just after 10 a.m.?

Why did it change the LCL in the R chart after 2 p.m.?

Why did it change the control limits on x-bar chart at 3 p.m.?

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Basic Statistics: How to change the control limits on x-bar chart
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