A healthcare quality professional is looking at a control chart and notices that last November...

Comprehensive and Detailed Explanation From Exact Extract:

In the Health Data Analytics domain, data points outside the upper or lower control limits on a control chart represent special cause variation, meaning an unusual or assignable cause exists outside the system’s normal variation.

In this scenario, the spike in flu admissions likely reflects an external event, such as a seasonal influenza outbreak. Common or random variation reflects natural fluctuations within the system’s normal limits, whereas this exceeds the control limit, indicating a special cause.