While a process operating with only common (normal) causes of variation is said to be in statistical control, a process operating in the presence of assignable (abnormal) causes is said to be out of control. Below picture shows change of process performance over time. What can be inferred from the distribution of process outcome in a red circle? 0 0 0 Only chance causes of variation present; process is in control. LSL Ho Assignable cause two is present; process is out of control. Assignable cause one is present; process is out of control. USL Assignable cause three is present; process is out of control. % > Process quality characteristic, x Process is in control since the variation stays within specification limits. Process is out of control since the mean has shifted to the right. Process is in control since the mean has shifted to the right. Process is out of control since the variation has increased beyond specification limits. Time, t 0100

While a process operating with only common (normal) causes of variation is said to be in statistical control, a process operating in the presence of assignable (abnormal) causes is said to be out of control. Below picture shows change of process performance over time. What can be inferred from the distribution of process outcome in a red circle? Process is in control since the variation stays within specification limits. Process is out of control since the mean has shifted to the right. Process is in control since the mean has shifted to the right. Process is out of control since the variation has increased beyond specification limits