17. 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?

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Xt M Xt M 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