After the rapid-fire round comes the open-ended case study. The interviewer hands you a vague, realistic prompt (“here are five years of minute bars, find me an alpha”) and watches how you think. There is no single right answer. They are testing whether you can turn a fuzzy business problem into a precise, leakage-safe, testable plan, and whether you know where it will go wrong before it does. This lesson gives you a reusable structure for any case study, then walks three classic prompts end to end so you can hear what a strong spoken answer sounds like. The theory behind every step lives in the earlier modules, so we cross-link rather than re-derive.
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