Читать книгу Statistics and Probability with Applications for Engineers and Scientists Using MINITAB, R and JMP - Bhisham C. Gupta, Irwin Guttman - Страница 107

St. Luke's Hospital is a fully accredited 560‐bed hospital with more than 2600 associates and 381 physicians who provide 24‐hour coverage in east central Iowa. Founded in 1884 as the community's first hospital, today St. Luke's is a member of the Iowa Health System. The hospital offers a comprehensive array of inpatient services including medical/surgical, cardiology, oncology, neurology, inpatient and outpatient behavioral health, and neonatal intensive care; it delivers a broad range of diagnostic and outpatient services, and provides a 24‐hour trauma center and an air ambulance service. St. Luke's five‐point strategy to gain patient satisfaction focused on:

 Demonstrating better quality

 Becoming the workshop of choice for physicians

 Partnering with associates

 Strengthening the core (making sure the hospital is financially sound)

 Establishing the hospital as a regional workshop of choice to better serve organizations and promote health care in the region

Tables 2.10.1–2.10.3 document the improvement at St. Luke's.

Construct the relevant graphs summarizing the data in this case study and interpret them. Then, prepare the progress report that you would like to present to the Board of Directors of the hospital.

Table 2.10.1 Turnaround time for inpatient lab testing once the swarm method was implemented.

Month/Year	Inpatient tests reported within
	23 minutes of receipt (%)
June 2007	63
July 2007	84
August 2007	71
September 2007	77
October 2007	84
November 2007	93
December 2007	94

Table 2.10.2 Physician satisfaction scores at St. Luke's Hospital before and after the hospital's “breaking out of the pack” strategy.

Year	Physician satisfaction score (percentile score)
2004	81
2006	95

Table 2.10.3 Inpatient satisfaction scores after St. Luke's implemented the standards of excellence of the four tools centered on the patient and family experience.

	Patient satisfaction score
Quarter‐Year	(Percentile rank among 400–599 peer)
2nd‐2004	49
3rd‐2004	65
4th‐2004	93
1st‐2005	88
2nd‐2005	93
3rd‐2005	90
4th‐2004	93
1st‐2006	93
2nd‐2006	91
3rd‐2006	95
4th‐2006	91
1st‐2007	90

Case Study 2 (Part measurements using a micrometer)2 The goal of this study is to develop a process with reduced variation among machines producing some parts. During this study, diameters of a part are measured using a standard micrometer with readings recorded to 0.0001 of an inch. The data for this case study is available on the book website: www.wiley.com/college/gupta/statistics2e.

Do the followings:

1 Construct box plots for the three sets of data, that is, from machine‐1, machine‐2, and machine‐3, and compare average values of the diameter of the parts produced by the three machines.

2 Determine the variances for the three sets of data, compare them, and write your conclusions.

3 Determine the coefficient of variation for the three sets of data, compare them, and write your conclusions.

4 Compare your conclusions in Parts 2 and 3 above, and comment.