Question: Nine bottles are taken each week from a capping process and the seal strength tested. The following are the sample mean seal strengths and ranges

Nine bottles are taken each week from a capping process and the seal strength tested. The following are the sample mean seal strengths and ranges (in ft-lbs) for the last seven weeks. Find the UCL & LCL for the sample means (x-bar chart) and ranges (R chart) Comment on whether the process is in or out of control and explain why.

Please no excel, show formulations as I get a better understanding.

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Nine bottles are taken each week from a capping

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