Equivalence of moving average and exponentially weighted moving average control charts.

9.39.Equivalence of moving average and exponentially weighted moving average control charts. Show that if l = 2/(w + 1) for the EWMA control chart, then this chart is equivalent to a w-period moving average control chart in the sense that the control limits are identical in the steady state.page 446 in the book ( in the attachment)

In the EWMA control chart varianceHence control limits are The term goes to unity as gets larger and larger because 0 < λ < 1 so asgets larger and larger.This means the EWMA control chart...