{"blocks": [{"key": "29d200e2", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "b34398f6", "text": "Product decision cases: 1) whether to add a banner ad, 2) whether to launch a group-story feature.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "d1b465a9", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "37ab84ed", "text": "What key metrics would you track to measure the impact of adding a banner ad versus not adding it? How would you design and analyze an A/B test to decide if the banner should be launched, including handling accidental clicks? For the group-story feature, which success metrics would you define and how would you set up the experiment (units, sample size, duration) to decide on launch?", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "99a922f2", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "9c039e48", "text": "Think CTR, dwell time, efficiency, retention, experiment design, guardrails, segmentation.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}