Question

Discuss why it is important to establish control on the R chart first when using and R control charts to bring a process into statistical control.

Answer 1

Answer:

See below

Explanation:

The importance of establishing control in this case stems from the fact that as the points in these type of charts exceed beyond the set limits, it is possible that those points get eliminated and a revised value of R can be obtained. Accordingly, the limits and the center line also get revised on an R chart and x chart. This also allows for the limits to get tighter on both of the charts.