New One-Sided EWMA t Charts without and with Variable Sampling Intervals for Monitoring the Process Mean

Table 1

The UCL⁺ of the U-NEWMA t chart when ARL₀ = 200.

λ	n = 5	n = 7	n = 9	n = 11
0.10	0.6811	0.5958	0.5614	0.5430
0.20	1.1493	0.9854	0.9227	0.8880
0.30	1.5763	1.3314	1.2367	1.1838
0.40	1.9932	1.6610	1.5315	1.4634
0.50	2.4137	1.9866	1.8214	1.7343
0.75	3.4872	2.8192	2.5577	2.4219
0.90	4.1474	3.3416	3.0280	2.8575
1.00	4.5961	3.7043	3.3526	3.1667