ocr: TOOCOMMON 45 35 Upper control limit 30 Mistake 2: Ignore this point, likely 1o constifute 25 aspecial cause of variation. 20 15 10 Mistake 1:Assume that this point constitutes special cause variation. 5 Lower controllimit D 11 16 21 26 30 Figure 1: Tbis sample control cbart llustrates o cnmmon erop Joumd wben dealng wito zartatisn.
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