Data visualization represents data or information graphically so readers can recognize patterns, comparisons, trends, outliers, and other insights. In quantitative analysis, visualization supports exploration, modeling, presentation, and decision-making. section 1.2.1 section 14.0
Visualization serves several practical purposes:
- Communicate complex data more immediately than numerical tables alone. section 14.0
- Support statistical quality control by revealing process trends, variability, and departures from expected behavior. section 14.0
- Integrate with Python workflows using libraries such as Matplotlib and seaborn. section 1.2.1
Control charts in quality control
A control chart plots process data over time against control limits. A p-chart tracks the proportion of defective items, while an np-chart tracks the number of defective items in a sample. Points outside expected limits signal possible instability and prompt investigation and corrective action. section 14.0















