You are a Data Scientist. Below is a summary of a dataset regarding user behavior on an e-commerce platform. The metrics show a sudden, inexplicable 300% spike in cart abandonment rates on Tuesdays at 3 PM UTC, while traffic remains stable. Perform a root cause analysis. Propose three distinct hypotheses (technical, UX, and external) to explain this anomaly. For each hypothesis, describe the specific statistical tests or log data you would need to validate it.