Control limits for the Phase I EWMA chart with λI = 0.6 obtained from 50000 sets of k = 50 normal samples of size n = 5 for both the formulations of the ESEM.

Table 2: Control limits for the Phase I EWMA chart with λ_I = 0.6 obtained from 50000 sets of k = 50 normal samples of size n = 5 for both the formulations of the ESEM.

Normal parameters estimations		Zwetsloot’s formulation		Shen’s formulation
$\hat{μ}$	$\hat{σ}$	LCL	UCL	LCL	UCL
-0.01935	1.01798	-0.79722	0.75852	-0.79237	0.75248
0.05729	0.99620	-0.70394	0.81852	-0.69584	0.80936
0.01954	1.03771	-0.77340	0.81248	-0.76644	0.80600
0.03217	1.05359	-0.77291	0.83725	-0.76938	0.83031
0.02998	0.97172	-0.71254	0.77250	-0.70355	0.76304