NUM MEMOIRE 128/128 939822 939823 board

NUM 0224939823 0204939823 939823

If the process is in control, almost all (99.73%) points will plot within the control limits. Any observations outside the limits, or systematic patterns within, suggest the introduction of a new (and likely unanticipated) source of variation, known as a special-cause variation. Since increased variation means increased quality costs, a control chart "signaling" the presence of a special-cause requires immediate investigation. NUM MEMOIRE 128/128 939822