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T20-00 - 1 T20-00 Range Chart Control Limit Calculations Purpose Allows the analyst to calculate the "Range Chart" 3- sigma control limits based on table lookup. Inputs Sample Size Centerline (average range) Outputs Range Control Chart LCL & UCL

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T20-00 - 2 Range Chart (R Chart) The Range Chart Centerline, UCL and LCL are calculated by the following formula.

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T20-00 - 3 3 Sigma Control Chart Table

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T20-00 - 4 The range of 20 samples each containing 5 observations are shown here. The average range can now be calculated. This can be done by using the Descriptive Statistics Template or more quickly by using the EXCEL built in AVERAGE function on this set of numbers. Calculate the Control Limits for the Range Control Chart. Average Range Example

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T20-00 - 5 Input the Sample Size and Centerline (average range) in the light green cells. The LCL, UCL are automatically calculated based on a table lookup for D3 and D4.

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