What Does 3 sigma rule for limits Mean?

If $f$ is a true-valued operate described over a set $Esubset mathbb R$ (or $subset mathbb R^k$), the upper and lower limits of $file$ at $x_0$ are denoted byTo perform these types of statistical procedure checking, we look at control charts. In the event the control chart suggests that the procedure is from control and variation is higher than the

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