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Data Science & Analytics Interview Questions & Answers

Statistical modeling, hypothesis testing, feature engineering, SQL data pipelines, and exploratory data analysis.

Medium 57 views

Why can an overall conversion rate improve while conversion falls in every major segment?

This can happen when the mix shifts toward segments with higher baseline conversion, an example of Simpson’s paradox. Suppose both mobile and desktop conversion decline, but a larger share of traffic ...

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Easy 52 views

How do mean and median behave differently when salaries contain extreme values?

The mean uses every value and can move substantially when a few salaries are very high. The median is the middle ordered value and is less sensitive to those extremes. For a highly skewed salary distr...

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Easy 51 views

What questions should you ask before filling missing values in a dataset?

Ask what each missing value means, how it was recorded, and whether absence is related to the outcome or another variable. A missing purchase amount might mean a failed data transfer, an unavailable m...

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Medium 48 views

A dashboard shows revenue rose 20%. What would you check before calling it business growth?

Verify the revenue definition, currency conversion, reporting timezone, returns, taxes, and whether the period is complete. Compare equivalent periods and account for seasonality, acquisitions, price ...

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Medium 48 views

Two datasets disagree about active customers. How would you reconcile them?

Agree on a precise definition of active customer, including date window, timezone, account status, and treatment of trials or deleted accounts. Compare source lineage, refresh times, identity mappings...

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Medium 46 views

How would you design an A/B test for a new signup page?

Define the primary outcome, meaningful effect size, guardrail metrics, randomization unit, and planned duration before launch. Randomize eligible users consistently, avoid counting repeated visits as ...

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