What is the purpose of control limits?174
1 Identifying “rule of seven” patterns in control charts.
2 Increasing process quality from 3σ to 6σ.
3 Specifying the range of acceptable results.
4 Identifying whether the process is in control or not.

Guys,

The answer is 4,

I am not too sure of this one.. Because When your have "rule of seven" the process is out of control and the control limits doesnt help at all to figure if you have rule of seven.

Instead I feel that the "3" is good

what do you think