{"blocks": [{"key": "633e3cfd", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "b7dd1f04", "text": "The company plans to launch a new video-ad format and needs an experimental framework to evaluate its effectiveness.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "f829b293", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "39ac4a78", "text": "Design an experiment to measure the impact of the new video ads. Include unit of randomization, primary/secondary metrics, sample-size/power considerations, and success criteria. If the primary metric shows no statistically significant improvement, what follow-up analyses or alternative actions would you take?", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "2285c99d", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "de1dd60a", "text": "Cover A/B vs. multivariate, geographic splits, sequential testing, metric deep-dive, heterogeneous treatment effects, experiment extensions.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}