Boston Tech India Data Scientist Interview Questions
The questions to prepare for a Boston Tech India Data Scientist interview. Questions from real interview reports rank first. Updated daily.
Write a SQL query to find the top 10 users with the highest activity in the last month. Treat activity as the number of activity events during the previou...
Calculate monthly cohort retention using date-based cohorts, aggregation, and window functions.
Calculate each user's seven-day rolling average of daily events using PostgreSQL window functions.
Explain how statistical significance differs from practical significance and how both affect an A/B test decision.
Determine the sample size needed to detect a meaningful A/B test effect at a chosen significance level and power.
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Investigate a sudden 15 percent decline in weekly active users for an enterprise analytics product and identify the root cause.
Explain how to establish statistical significance in A/B tests using hypotheses, power, confidence intervals, and safeguards against false positives.
Outline the first checks to diagnose a sudden drop in a core product metric, starting with data quality, scope, and decomposition.