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472 Appendix 3 2) S Chart Comparison Analysis For June 1999: Then, the expected range is: Since |Z| = 0.319 < 2.576, the observed value for June 1999 is not a statistical outlier at 1% significance level. The same conclusion for June 1999 performance can be drawn using the expected range approach because the observed value 7.93 is within the expected rage . PMSID=1 HCOID=1 MEASID=4 10 9 8 7 6 5 G GGGG G GGGG G G DATE 07/1998 08/1998 09/1998 10/1998 11/1998 12/1998 Mean 01/1999 02/1999 03/1999 04/1999 05/1999 06/1999 Appendix 3 473 Source: The content of Appendix 3, including all figures, is largely based on Lee and McGreevey . © Joint Commission Resources: Mining ORYXTM Data 2000: A Guide for Performance Measurement Systems. Oakbrook Terrace, IL: Joint Commission on Accreditation of Healthcare Organizations, 2000. Reprinted with permission.

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