The UCL and LCL for An $\bar { X }$ -Chart Are 25 and 15 Respectively

question 4

Multiple Choice

The UCL and LCL for an $\bar { X }$ -chart are 25 and 15 respectively.The central line is 20,and the process variability is considered to be in statistical control.The results of the next six sample means are 18,23,17,21,24,and 16.What should you do?

• A) Nothing; the process is in control.
• B) Explore the assignable causes because the second and fifth samples are above the mean.
• C) Explore the assignable causes because there is a run.
• D) Explore the assignable causes because there is a trend.

---

Definitions:

Program Modes

Refer to distinct states or settings in which a device, application, or system can operate, each designed for performing specific tasks or operations.

Single Scan Test Mode

A diagnostic mode in programmable controllers where the system executes one program scan, useful for troubleshooting and testing.

On-Line Program Mode

Refers to a state where a device, such as a computer or PLC, can be programmed and controlled in real-time while connected to a network or system.

Contact Histogram

A graphical representation that displays the distribution of contact points or events over a specified time period.