Statistical procedures have been developed using the trend as well as the variation to evaluate whether a process is out of control.

Question

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Statistical process control (SPC) uses both trend and variation analysis to determine if a process is stable and in control, or if there are issues that need to be addressed. Various control charts, such as the X-bar and R chart or the individuals and moving range chart, can help identify when there is a significant deviation from the expected pattern or level of variation in a process. The objective is to detect and correct these variations quickly to prevent defects or other quality problems from occurring.

Statistical Procedures Have Been Developed Using the Trend as Well