Enter the historical mean for Laney U' Chart

Stat > Control Charts > Attributes Charts > Laney U′ > U′ Options > Parameters

Enter the historical value for the mean that Minitab uses to calculate the center line and control limits. If you do not specify a parameter, Minitab estimates the mean from the data. You can enter a single mean for the entire chart, or you can enter a mean for each stage.

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