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MinitabB (www.minitab.com). Minitab Inc., 3081 Enterprise Drive, State College, PA 16801-3008. StatView (www.statview.com). SAS Institute, Inc., SAS Campus Drive, Cary, NC 27513-2414. SYSTAT (www.spssscience.com). SPSS Science, Inc., 233 S. Wacker Drive, 11 , Chicago, IL 60606-6307. SAS/STAT (www.sas.com). SAS SAS Institute, Inc., SAS Campus Drive, Cary, NC 27513-2414. Statistical Package for the Social Sciences (SPSS) Student Version 11.0 for Windows andVersion 6.0 for Macintosh (www.spss.com). , SPSS Science, Inc., 233 S. Wacker Drive, 11 , Chicago, IL 60606-6307.

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