In tracking quality metrics over time, the seven run rule holds that if seven data points in a row are all below the mean, above the mean, or are all increasing or de- creasing, then the process may be out of control. Why, and what is the rationale for us
One page double space.
It is talking about quality Management.
Why is it out of control in case of the seven points ?
What is the rationale for using seven data points rather than some other number?