Final answer:
A control chart typically does not include an (Option a)'outer limit.' Defaults on a control chart include a target line, lower control limit (LCL), and upper control limit (UCL). 'Outer limit' is not a conventional term in the context of control charts.
Step-by-step explanation:
A control chart is a tool used to monitor, control, and improve process performance over time by displaying the variation in process metrics. It typically includes a central line for the average, an upper control limit (UCL), and a lower control limit (LCL). These limits are calculated from the data and are used to help determine whether the process variation is due to common causes (natural variation) or special causes (issues to be addressed).
The options provided are: a) outer limit, b) target line, c) lower control limit (LCL), and d) upper control limit (UCL).
The correct answer is a) outer limit. A typical control chart includes a target line, which represents the desired level of performance or the process mean. It also includes a lower control limit and an upper control limit, which represent the threshold for variation due to common causes. An 'outer limit' is not a standard term used in control charts. Therefore, it is the value that typically does not show on a control chart.