Select the method or formula of your choice.

Plotted points

Each data point, xi, is an observation.

Center line

The center line represents the process mean, μ. If you do not specify a historical value for the process mean, Minitab uses the mean of the observations.

Control limits

If you do not specify a historical value for the process standard deviation, σ, then Minitab estimates σ from your data using the specified method.

Lower control limit (LCL)

Upper control limit (UCL)

Notation

TermDescription
μprocess mean
kparameter for Test 1. The default is 3.
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