Diagnose a 10% Drop in Successful Deliveries

Scenario

You manage a territory in a food-delivery marketplace and observe that the number of successful deliveries has dropped by 10% in that territory compared to the recent baseline.

Assume “success rate” = successful deliveries / attempted deliveries. Clarify whether the 10% drop is relative (e.g., 90% → 81%) or absolute (e.g., 90% → 80%). If not specified, state how you would handle this ambiguity.

Question

How would you diagnose the 10% drop in successful deliveries? Outline:

• The data cuts/segmentations you would run.
• Your key hypotheses for root causes.
• The statistical tests (and thresholds) you would apply, including time-series vs. cross-sectional checks.

Hints

Discuss segmentation, time-series vs. cross-section checks, and which customer/merchant/dasher metrics you’d examine, along with significance thresholds.