Would you judge that process has been in control throughout

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Reference no: EM13901958

The following data represent 25 successive subgroup averages and moving averages of span size 5 of these subgroup averages. The data are generated by a process that, when in control, produces normally distributed items having mean 30 and variance 40. The subgroups are of size 4. Would you judge that the process has been in control throughout?

X t	Mt	X t	Mt
35.62938	35.62938	35.80945	32.34106
39.13018	37.37978	30.9136	33.1748
29.45974	34.73976	30.54829	32.47771
32.5872	34.20162	36.39414	33.17019
30.06041	33.37338	27.62703	32.2585
26.54353	31.55621	34.02624	31.90186
37.75199	31.28057	27.81629	31.2824
26.88128	30.76488	26.99926	30.57259
32.4807	30.74358	32.44703	29.78317
26.7449	30.08048	38.53433	31.96463
34.03377	31.57853	28.53698	30.86678
32.93174	30.61448	28.65725	31.03497
32.18547	31.67531

Reference no: EM13901958

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