Median centerline after discovering the average

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“median centerline”. After discovering the average infection rate, it was determined that thestandard deviation fell at 0.442411412 – resulting in an upper control limit at 2.003068 (grayline) and lower control limit at -0.651401 (yellow line). Once the control chart was complete, itwas also determined that the process is in statistical control because the maximum point ofinfection (blue line) did not deviate outside of either the upper or lower control limit lines. Thisis supported by authors Evans and Lindsay (2017) who state, “When a process is in statisticalcontrol, the points on a control chart fluctuate randomly between the control limits with norecognizable pattern” (Ch. 8.5).
RECOMMENDATIONS4RecommendationAlthough the control chart suggests that the infection rate is statistically under control,the hospital should take into account that the data’s basis for sampling, sample size, samplefrequency, and control limit locations may need to be adjusted to acquire more accurate results.For instance, according to theJournal of Applied Statistics, control charts must be administeredconsistently to ensure that the samples are taken during conditions that may be out-of-control.Furthermore, extracted samples must be used in accordance with its standard deviation. In otherwords, sample sizes that are too big or too small can cause quality managers to overlook dataspikes (Chang & Gan, 2007). In short, Hallenvale Hospital should continue to extract datasamples and either widen or narrow its control limits so that they can be sure that the informationis not overlooked or considered during the wrong periods of time.The publication team for an engineering department wants to improve the accuracy of itsuser documentation but is unsure of why documents aren't error-free.It is recommended that the publication team uses the “5 why” technique to find the rootcause of the document inaccuracy. For instance, the quality manager could ask the administrationteam as to why the documents are inaccurate – after receiving their response, the quality managerwill document his or her findings and move on to the construction manager, then the architect,and so on and so forth until the root problem is identified and addressed.“5 Why” “approach forces one to redefine a problem statement as a chain of causes andeffects to identify the source of the symptoms by asking why, ideally five times” (Evans &Lindsay, 2011, Ch. 9.4). Specifically, quality managers can find the root to problems by asking“why” several times until finding and documenting the source of an issue (Zulkowski, 2018).

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Term
Summer
Professor
NoProfessor
Tags
Management, Control Chart, James Evans, quality managers

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