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?

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 out of control since the variation has increased beyond specification limits$.$

Process is in control since the variation stays within specification limits$.$

Process is in control since the mean has shifted to the right.

Process is out of control since the mean has shifted to the right.