Show that you investigated the surprise thoroughly before raising the alarm. One unexpected data point is a curiosity; a validated pattern is an insight.
Look for intellectual curiosity: did they investigate the unexpected result rather than dismiss it? Did they validate it through multiple angles? How did they communicate the surprising finding? Strong answers show that the candidate influenced real decisions based on data, not just confirmed what people already believed.
Reveals analytical courage. Some analysts only tell stakeholders what they want to hear. The best ones surface uncomfortable truths backed by solid evidence.