Chapter 17
Control Charts
Introduction to Statistical Process Control
Statistical process control or SPC applies statistical methods to ensure quality control across various sectors.
It helps differentiate normal process ...
Run Charts
A run chart is typically a line graph of sequential data points plotted over time. It reveals trends of a quantity over time.
For instance, a run ...
Interpreting Run Charts
Run charts help identify process stability or signs of unusual variations in routine activities, but how should they be interpreted?
Consider a run chart ...
The R Chart
Control charts, like the R or range chart, offer deeper insights into non-random process variations than run charts, which display data trends over time.
...
Interpreting R Charts
R charts help track variability in processes like manufacturing.
Their interpretation involves calculating key factors like the mean sample range ...
The X̄ Chart
The x̄ chart is a control chart designed to monitor the consistency of process means, which is pivotal for quality assurance.
It differs from ...
Interpreting X̄ Charts
The x̄ charts are essential for maintaining process consistency and quality.
Consider a factory measuring thickness across ten cookie batches to ...
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