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The effect of non-normality on the OC function of the sampling plan under EWMA is studied by deriving the OC function for a non-normal population represented by the first four terms of an Edgeworth series.

The effect of First Order Auto-Regressive model and non-normality on the power function of the control charts for mean with control limits is studied. The nonnormality is represented by the first four terms of an Edgeworth series. The nonnormality must be unimodel. We have seen that power of control charts for mean is robust to normality with auto-regression.

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