Data Scientist Statistics & Math Interview Questions
Practice 471 real Statistics & Math interview questions for Data Scientist roles. From companies including Meta, Capital One, Google, Amazon, Uber.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
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"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
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"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
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"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Differentiate and control Type I/II errors
A/B Test Powering and Error Control (Two-Proportion Z-Test) Context: You are planning a two-arm A/B test on sign-up conversion. The current baseline c...
Estimate delayed CVR nonparametrically with censored data
Today is 2025-09-01. We need the 14-day conversion rate (CVR14) for impressions served between 2025-08-18 and 2025-09-01, but many conversions occur w...
Compute posterior spam risk from flags
A binary classifier flags spammy requesters. Last week the base rate of spam among all requesters was 12%. The classifier has true positive rate (TPR)...
Compute p-values, CIs, and adjust multiples
Hypothesis testing and intervals in practice. Part A (z vs t): You sample n = 15 observations from a population with unknown variance and observe samp...
Compute p-values and adjust multiplicity
You test if a coin is fair after 20 flips and observe 17 heads. (a) Compute the exact two-sided p-value under a Binomial(20, 0.5) model. (b) Approxima...
Compute cluster-aware significance and sequential corrections
Cluster-Randomized Tipping UI Experiment: Power, Sequential Testing, and Multiplicity Context: A creator-level (cluster) randomized experiment evaluat...
Optimize attempts in a timed logic test
This question evaluates a candidate's understanding of expected value, time-constrained optimization, efficiency metrics (score per second), and discr...
Derive E[X^2] from mgf e^{t^2}
Identify Distribution and Compute E[X^2] from an MGF You are given a random variable X with moment-generating function (mgf): - M_X(t) = E[e^{tX}] = e...
Compute two conditional probability scenarios
Probability — Two-Part Question Solve both parts. Show formulas and provide final numeric values. Part A — Coin Type Given HHH - A box has 5 coins: 3 ...
Price options and bonds via binomial no-arbitrage
Binomial No-Arbitrage Pricing: Options and Bonds Setup and Assumptions - Two-period models; per-period simple compounding. - Discount per period: (1 +...
Model waiting-time abandonment via survival
Survival Modeling of Rider Abandonment During Pickup Waits Context You are modeling when a rider cancels (abandons) while waiting for pickup. Let time...
Define and compute retention and churn precisely
Retention and Churn for a Transactional Consumer App Context: You are analyzing retention and churn for a transactional consumer app (e.g., food deliv...
Derive uniform RNGs from limited or biased sources
Sampling Construction and Analysis: From rand5() to rand7(), General randM()→randN(), and Fairness from a Biased Source You have access to a uniform p...
Choose tests and solve distribution parameters
Engagement Comparison: New vs Existing Users (2025-08-05 → 2025-09-01) Context: You have per-user daily session counts (integer, skewed, many zeros) f...
Derive and validate DID for staggered rollout
Causal Effect of a Staggered Adoption Policy Across EU Regions You cannot randomize. An intervention is rolled out at different dates across EU region...
Measure rider incentive causal ROI
Rider Incentive Targeting: Causal Incrementality, ROI, and Spillovers Context: You plan a rider‑side incentive (e.g., “20% off up to $10”) targeted by...
Choose estimators for panel rent regressions
Panel Rent–Vacancy Elasticity and Inference: Design, SEs, and Time-Series Diagnostics Context You have a monthly property-level panel from 2010-01 to ...
Optimize thresholds under fraud costs
Cost-sensitive Thresholding for Fraud (ATO) Classifier Context You are evaluating a binary classifier for account takeover (ATO) fraud on a large vali...
Calculate power and test duration
A/B Test Sizing: Reducing Cold-Food Complaint Rate You are running an A/B test of thermal delivery bags aiming to reduce the cold-food complaint rate....
Maintain target margin with fixed costs
Target Profit Margin With a Mixed-Product Portfolio Context You sell two burger products (classic and vegan) at the same price but with different unit...