Certified Production & Operations Manager (POM) Practice Exam

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In quality management, what is the primary function of an R-chart?

To evaluate the mean of a process
To monitor changes in dispersion
To track the number of defects over time
To assess customer satisfaction levels

The correct answer is: To monitor changes in dispersion

The primary function of an R-chart, or range chart, is to monitor changes in dispersion or variability within a process. It is specifically designed to observe the range of variation in a set of data points, which provides insights into the consistency and stability of the process. When organizations apply statistical process control (SPC) techniques, maintaining an understanding of variation is crucial. The R-chart allows managers and quality professionals to see shifts in variability that may indicate issues that require attention, such as machine wear or changes in materials. This assists in maintaining product quality and ensuring deviations from expected performance are minimized. While other options relate to quality management practices, they focus on different aspects. Evaluating the mean of a process is done using X-bar charts, tracking defects aligns more with defect charts, and assessing customer satisfaction levels falls outside the direct scope of quality control charts, which are heavily focused on process measurements and variations.