Voodoo Data Scientist Interview Questions
The questions to prepare for a Voodoo Data Scientist interview. Questions from real interview reports rank first. Updated daily.
Explain when exact, permutation, or Bayesian methods are appropriate for determining significance with a small experiment sample.
Explain statistical significance, p-values, practical importance, and uncertainty to a non-technical stakeholder.
Calculate each active user's rolling seven-day revenue average with daily aggregation and window functions.
Diagnose a 5% drop in Intercom daily active users, separating data quality issues from real changes in user behavior.
Explain your experience selecting and interpreting model evaluation metrics across machine learning tasks.
Explain practical ways to train and evaluate a classifier when the target classes are highly imbalanced.
Identify the major pitfalls in mobile game A/B tests and explain how to design around them before making a ship decision.
Define a success metric for a new feature that captures real user value, not just raw usage.
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Calculate daily TikTok DAU and the percentage of eligible market users active each day.
TikTokCompute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.
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Spotify
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