CONTROL CHARTS FOR STATISTICAL PROCESS CONTROL

EXAMPLE 3, PROCESS SIGMA NOT KNOWN, XBAR – STD DEV CHART. Assumptions: Target value = 100 , SBAR (from the run data ) = 10, n=5. The process would be adjusted until the XBAR values are centered on the target value of 100. The mean of the Std Dev values, SBAR, is related to the unknown value of σ and is used in the formulas. ................
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