A Simple Approach for Monitoring Business Service Time Variation

Table 5

The ARL₁ of the symmetric EWMA mean chart (𝜆₁=0.05, 𝑝_𝑚0=0.5 with ARL_𝑚0≈370).

𝑛1	𝑝𝑚1
	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9
10	4	5	8	19	371	19	8	5	4
11	4	5	8	18	370	18	8	5	4
12	4	5	7	17	380	17	7	5	4
13	3	5	7	16	377	16	7	5	3
14	3	4	7	15	378	15	7	4	3
15	3	4	7	15	386	15	7	4	3
16	3	4	6	14	371	14	6	4	3
17	3	4	6	14	384	14	6	4	3
18	3	4	6	13	375	13	6	4	3
19	3	4	6	13	388	13	6	4	3
20	3	4	6	12	389	12	6	4	3
21	3	4	5	12	379	12	5	4	3
22	3	4	5	12	383	12	5	4	3
23	3	4	5	11	383	11	5	3	3
24	3	3	5	11	381	11	5	3	3
25	3	3	5	11	377	11	5	3	3