User's Manual Part 2

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5.4.5.2. X-Bar Chart
The X-Bar Chart is the graphical chart produced from samples of a flagged parameter on
the Spreadsheet Page Tab. The chart uses a rolling average of 2 through 6 sample
points. The user can specify the sample points on the SPC Page Tab of the Preferences
dialog box. The X-bar is the average of the data samples and the UCL and LCL are
calculated using a formula based on the Range data.