This question evaluates a candidate's competency in statistical analysis, time-series forecasting, variance estimation, and sampling design for comparing platform versus in-store price inflation across matched merchant–item pairs.

You are asked to compare price inflation on the DoorDash platform versus in-store menu prices over time for the same merchants and items. The goal is to:
Assume you have access to transaction-level platform data and periodic in-store (offline) price observations for the same merchant–item pairs.
Describe, in detail, how you would:
Include guidance on: data collection, time-series analysis, variance estimation, confidence intervals, and MDE.
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