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."
Determine Probability of Both Children Being Boys
Conditional Probability: Two Children A family has two children. You learn that at least one of them is a boy. Answer the questions below and state yo...
Compare Normal and Poisson Distributions in Statistics
Comparing Normal and Poisson Distributions You are modeling event counts, such as number of clicks, and continuous measurements, such as response time...
Test coin fairness from 560 tails in 1000 flips
You flip a coin n = 1000 times and observe 560 tails. At significance level α = 0.05, test whether the coin is fair. - State the null and alternative ...
Why does the CLT matter?
The question evaluates a candidate's understanding of the Central Limit Theorem and related competencies in probabilistic reasoning, estimation, and c...
Analyze distribution of a 3-dice product
This question evaluates probability and statistical inference skills including computation of expectation, properties of discrete order statistics (po...
Determine knights and knaves roles
Determine knights and knaves roles Knights and Knaves Logic Puzzle Context On an island, each person is either: - Knight: always tells the truth. - Kn...
Evaluate Marketing Campaign's Click-Through Rate Effectiveness
Evaluate Marketing Campaign's Click-Through Rate Effectiveness Scenario A campaign currently shows a click-through rate (CTR) of 4.2%. Leadership asks...
Differentiate P-value and Confidence Interval in Statistics
Differentiate P-value and Confidence Interval in Statistics Statistics Knowledge Check (Onsite Data Scientist) Task Explain core inferential statistic...
Calculate Expected Flips for Heads-Tails Sequence
Calculate Expected Flips for Heads-Tails Sequence Probability Check — Waiting Time for HT Setup - You repeatedly flip a fair coin (independent flips; ...
Calculate Probability of Heads in Coin Flip Experiment
Calculate Probability of Heads in Coin Flip Experiment Coin Flips: Counting and Binomial Probabilities Context Assume 10 independent flips of a fair c...
Calculate Posterior Fraud Probability Using Bayes' Theorem
Calculate Posterior Fraud Probability Using Bayes' Theorem Posterior Fraud Probability After a Flag Context You operate a fraud detection system that ...
Estimate and Derive Regression Coefficient for X on y
Estimate and Derive Regression Coefficient for X on y Statistics & Probability Onsite — Two-Part Question Context - You have a simple linear data-gene...
Determine Probability of Friend Request Being Fake
Determine Probability of Friend Request Being Fake Scenario You operate a platform where 95% of accounts are real and 5% are fake. Fake accounts send ...
Estimate Treatment Effects Using PSM, DiD, and DML Methods
Estimate Treatment Effects Using PSM, DiD, and DML Methods Causal Impact of Marketing Campaigns: PSM, DiD, Synthetic Control, and DML Scenario You hav...
Should you play a dice payout game?
Two players each roll a fair six-sided die once. - If you win (your roll > opponent’s roll), the opponent pays you $n. - If the opponent wins or it’s ...
Compute probability in urn with green returns
Compute probability in urn with green returns Urn Sampling with Replacement for Greens Only You have an urn with colored balls. You repeatedly draw on...
Calculate Incremental Customers for Marketing Spend Justification
Incremental Customers Needed for Marketing Spend You previously computed the per-customer annual profit for a new cardholder, excluding partnership ma...
Explain Type I and Type II Errors in Hypothesis Testing
Type I and Type II Errors in Hypothesis Testing You are discussing hypothesis testing in the context of a modeling or experimentation project. Define ...
Compare Ad-Insertion Strategies: Expected Ads and Probabilities
Newsfeed Ad-Insertion Strategies You are evaluating two ways to insert ads into a user's newsfeed. A user views a contiguous sequence of posts. - Stra...
Explain Central Limit Theorem's Importance in A/B Testing
Explain the Central Limit Theorem's Importance in A/B Testing This statistics prompt asks you to state the Central Limit Theorem, explain why it matte...