Techolution Data Scientist Interview Questions
The questions to prepare for a Techolution Data Scientist interview. Questions from real interview reports rank first. Updated daily.
Calculate each customer's 30-day rolling engagement average using a PostgreSQL window function.
Assesses SQL problem-solving and translating data into business impact.
Find each user's longest consecutive login streak by deduplicating login dates and identifying gaps between days.
Didi Chuxing
ByteDanceCalculate a calendar-based 30-day moving average of daily energy consumption using PostgreSQL window functions.
Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.
Determine A/B test sample size from baseline rate, MDE, significance level, and power, then validate the calculation through simulation.
Assesses your model selection judgment across accuracy, latency, and data requirements.
Diagnose a below-expectations product metric drop using decomposition, guardrails, and experiment checks.
Define a success metric for a new feature that captures real user value, not just raw usage.
Explain statistical significance, p-values, and practical importance to a non-technical stakeholder.
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