{"blocks": [{"key": "bf24913d", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "85bc485c", "text": "Company is considering launching a new in-app Video Call feature and has full historical user and call data available.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "810e6bab", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "52818d4c", "text": "Using the available data, how would you determine whether users need an in-app Video Call feature? 2. After launch, what success and guard-rail metrics would you track to evaluate feature quality? 3. Describe step-by-step how you would design and run an A/B test for this feature. 4. What are the engineering pros and cons of enforcing a hard hang-off (automatic call termination) policy, and how might that affect experiment results?", "type": "unordered-list-item", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "d085d03c", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "84648eaa", "text": "Think funnel, engagement, retention, power-user segmentation, experiment unit, sample size, run duration, and potential user experience trade-offs.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}