# T20-01 Mean Chart (Known Variation) CL Calculations - PowerPoint PPT Presentation

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T20-01 Mean Chart (Known Variation) CL Calculations. Purpose Allows the analyst calculate the "Mean Chart" for known variation 3-sigma control limits. Inputs Sample Size Centerline (Grand Average)Process Standard Deviation Outputs Mean Control Chart LCL & UCL. Standard Error.

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T20-01 Mean Chart (Known Variation) CL Calculations

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T20-01 Mean Chart (Known Variation) CL Calculations

PurposeAllows the analyst calculate the "Mean Chart" for known variation 3-sigma control limits.

InputsSample Size Centerline (Grand Average)Process Standard DeviationOutputsMean Control Chart LCL & UCL

Standard Error

Mean Chart ( Chart) - Known Variation

The Mean Chart Centerline, UCL and LCL (3 sigma limits) are calculated by the following when the variation of the process isknown.

Example

The mean of 20 samples each containing 5 observations are shown here. They have been taken from a process with known variance of .04. The grandaverage can now be calculated. This can be done by using the Descriptive Statistics Template or more quickly by using the EXCEL built inAVERAGEfunction on this set of numbers.

Calculate the Control Limits for the Mean Control Chart.

Grand Average

The LCL, UCL are automatically calculated

Input the Sample Size, Centerline (Grand Average), and Process Standard Deviation in the light green cells.