An article in Quality & Safety in Health Care [Statistical Process Control as a Tool for Research

An article in Quality & Safety in Health Care [€œStatistical Process Control as a Tool for Research and Healthcare Improvement,€ (2003)Vol. 12, pp. 458€“464] considered a number of control charts in healthcare. The following approximate data were used to construct XÌ… ˆ’ S charts for the turn around time (TAT) for complete blood counts (in minutes). The subgroup size is n = 3 per shift, and the mean standard deviation is 21. Construct the XÌ… chart and comment on the control of the process. If necessary, assume that assignable causes can be found, eliminate suspect points, and revise the control limits.

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2 3 4 10 11 12 13 14 31 9. 25 39 40 30 49 TAT 51 73 28 52 65 49 51 50 25 39 40 4) 3.