통제 상태 in (statistical) control out of control
변동 유형 존재 only chance causes of variation presence of assignable causes
도식 point plots within the control limits
all point fall inside the control limits point plosts outside the control limits
정상 상태 normal states abnormal states
수식 LCL < w < UCL w < LCL or w > UCL
반응 - alarm