Click SigmaXL > Templates & Calculators > Control Chart Templates > Basic > Individuals. Enter the data as shown:
Click the Individuals Control Chart button to produce the Individuals Chart (note that in actual application, one should use a minimum of 20 to 30 data points to compute the initial control limits).
Now enter the data as shown:
Click the Add Data button to add the “After” data to the Individuals chart.
Notes:
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