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"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"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."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"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."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"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."
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...
Compare average profit across mix scenarios
Burger Profit Mix — Scenario A vs. Scenario B Context: You sell two burger types (Regular and Vegan). In Scenario A, you sell only Regular. In Scenari...
Compute fraud probabilities with Bayes and Binomial
Fake-Account Detection with Binomial Sessions and Bayes Updating You are evaluating a rules-based detector for fake accounts on an online platform. Ea...
Compute P(Bag B | red) via Bayes
Bayes' Rule: Posterior Probability of the Chosen Bag Setup - There are three bags containing red (r) and green (g) balls: - Bag A: 4 r, 6 g (10 tota...
Use Bayes for factory identification
Bayesian inference: Which factory given two black widgets? Setup - Two factories produce red and black widgets. - Factory A: 40% red, 60% black. -...
Infer posterior after losing pick
Conditional probability after observing a loss You have three cats in a jumping contest: - Cat 1 (most athletic) wins with probability p1 - Cat 2 (mid...
Compute A/B test sample size and Bayes posterior
This question evaluates understanding of statistical power and sample size calculation for a two-sided A/B z-test as well as basic Bayesian posterior ...
Compute probability with colored balls draws
Compute probability with colored balls draws Probability with Replacement-on-Green Draws Context You have a bag with colored balls. You draw balls one...
Calculate Expected Users Adopting Wallet Feature
Calculate Expected Users Adopting Wallet Feature Wallet Feature Adoption – Probability and Expectation Setup - You are analyzing adoption of a new wal...
Evaluate Propensity Score Matching Alternatives and Diagnostics
Evaluate Propensity Score Matching Alternatives and Diagnostics Context You are reviewing an observational study that used Propensity Score Matching (...
Maximize Probability of Drawing Two Red Balls
Maximize Probability of Drawing Two Red Balls Optimize Two-Basket Allocation for Red-Red Draws Setup You have 100 red balls and 100 blue balls to dist...
Construct a 95% Confidence Interval for Comment Counts
Construct a 95% Confidence Interval for Comment Counts Comment Activity Analysis: Mean CI, Sampling Distribution, and 95th Percentile Context You have...
Determine Conditions for Multiplying Event Probabilities in Statistics
Determine Conditions for Multiplying Event Probabilities in Statistics Scenario You are modeling multiple, distinct risk events in Coinbase Wallet (e....
Analyze Rider Behavior in Dynamic-Pricing Trial
Analyze Rider Behavior in Dynamic-Pricing Trial Dynamic-pricing trial: rider behavior Context (assumptions made explicit) - Each day the rider has two...
Calculate Expected Streaks in Coin Toss Sequence
Calculate Expected Streaks in Coin Toss Sequence Expected Number of Streaks in Coin Tosses Scenario You toss a coin repeatedly. A "streak" (a run) beg...
Calculate Probability of Honest and Relevant Chatbot Answers
Calculate Probability of Honest and Relevant Chatbot Answers Chatbot Evaluation: Honesty and Relevance Scenario You are evaluating a customer-service ...
Compute answers to probability and counting puzzles
Compute answers to probability and counting puzzles evaluates statistical assumptions, formulas, estimation strategy, uncertainty, edge cases, and int...
Compute expected arc length on a circle
On the unit circle (radius \(1\), centered at the origin), pick three points independently and uniformly at random on the circumference. These three p...
Explain multicollinearity and OLS assumptions
Explain multicollinearity and OLS assumptions Linear Regression Technical Screen: OLS Assumptions and Multicollinearity Context: You are asked to summ...