You are investigating rider demand for a two-sided marketplace. In one region, weekly ride requests fell from 1.24M to 1.05M over the last 2 weeks, a 15% drop, while other comparable regions stayed roughly flat. Completed trips declined from 910K to 790K, and rider app opens were down only 3%, which suggests the issue may be deeper in the request funnel. During the same period, the team rolled out a Rider app update, adjusted upfront pricing in several cities, and saw heavier than usual rain in one metro area.
How would you investigate whether a regional issue is causing a drop in ride requests?