{"blocks": [{"key": "3c3494a6", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "0720a432", "text": "Mobile app sends push notifications and wants to ensure only high-quality notifications are shipped.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "50720f1c", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "f2f4642c", "text": "Propose and justify a metric that captures high-quality notifications. Given historical click-through-rate (CTR) data, how would you determine whether the current CTR is good or bad? Design an A/B test for a new notification strategy; explain experiment setup, success metrics, and how you would analyze the results in depth.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "a9bb0ac2", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "55656424", "text": "Cover metric formulation, baselines, segments, statistical power, validity threats, and post-test analysis.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}