A Shewhart x chart has center line at 10 with UCL = 16 and LCL = 4.

Question:

A Shewhart x chart has center line at 10 with UCL = 16 and LCL = 4. Suppose you wish to supplement this chart with an EWMA control chart using  = 0.1 and the same control limit width in σ-units as employed on the x chart. What are the values of the steady-state upper and lower control limits on the EWMA chart?