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Douglas C. Montgomery, Ph.D.
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| SPC Statistical Productivity Consultants | |
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| SPC Statistical Productivity Consultants P.O. Box 7327 Shawnee Mission, KS 66207-0327 |
| (913) 469-6736 (913) 469-6075 (FAX) |
| e-mail: ellen@spcstat.com |
| Douglas C. Montgomery, Ph.D. Ellen Averett, Ph.D. |