{"blocks": [{"key": "352832a6", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "def181f3", "text": "Designing and evaluating push notifications for a travel-recommendation mobile app (TripAdvisor-like).", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "4a7d4255", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "ab3e08cb", "text": "What primary success metrics would you track for a new push-notification feature and which guardrail metrics would you include (e.g., uninstalls, unsubscribes)? The app has strong network effects (users share itineraries). How would you design an A/B test for the notification while mitigating interference? Describe the unit of randomization and why.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "3a08a4c8", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "556396c5", "text": "Think engagement, retention, negative‐impact guardrails, and cluster-based randomization to reduce spillover.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}