Does it appear that the process was in control

Reference no: EM13903733

Assume that items produced are supposed to be normally distributed with mean 35 and standard deviation 3. To monitor this process, subgroups of size 5 are sampled. If the following represents the averages of the first 20 subgroups, does it appear that the process was in control?


Subgroup No.	X	Subgroup No.	X
1	34.0	6	32.2
2	31.6	7	33.0
3	30.8	8	32.6
4	33.0	9	33.8
5	35.0	10	35.8

Subgroup No.	X	Subgroup No.	X
11	35.8	16	31.6
12	35.8	17	33.0
13	34.0	18	33.2
14	35.0	19	31.8
15	33.8	20	35.6

Reference no: EM13903733

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