{"blocks": [{"key": "9c0045ed", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "7eb30703", "text": "About 10 % of fast-food restaurants are unprofitable. Product wants to add a $1 delivery-fee surcharge to those orders to cover the deficit.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "42e06b15", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "7a709024", "text": "Design an experiment to evaluate the impact of the $1 fee on restaurant-level profitability, order volume, and customer satisfaction. What specific techniques would you employ to increase the statistical power of this experiment?", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "27879cb6", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "744de561", "text": "Consider stratified randomization, CUPED, longer experiment horizon, geo-testing, or covariate blocking to reduce variance.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}