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."
Differentiate LDA and QDA; compute boundary
Binary Gaussian Classification: LDA vs QDA You are modeling a 2D binary Gaussian classifier with features (x, y): - Class 0: mean μ0 = (0, 0), covaria...
Optimize threshold using confusion matrix and costs
Calibrated Classifier on an Imbalanced Dataset (1% positives) You have a perfectly calibrated binary classifier evaluated on 10,000 held-out examples....
Choose tests for rare-event A/B analysis
This question evaluates expertise in statistical experiment design for rare binary outcomes, covering hypothesis test selection for low-event-rate pro...
Identify binomial model and compute moments
This question evaluates understanding of probability distributions and independence by identifying the binomial model and computing its probability ma...
Use DiD for staggered treatment adoption
Staggered DiD for a Weekly RPU Rollout (50 Regions, 2025-06-01 to 2025-08-15) Context and assumptions: - You have panel data at the region-week level ...
Apply PSM rigorously for observational A/B analysis
Task: Estimate ATT on 7-Day Retention Using Propensity Score Matching (PSM) Context You are given observational, user-level product data where users s...
Explain p-values and interpret regressions
Question This is a statistics rapid-fire onsite for a Data Scientist role. Answer each part clearly and precisely — first as if explaining to a Produc...
Compute multi-step Markov probabilities and estimate transitions
This question evaluates understanding of discrete-time Markov chains, computation of multi-step transition probabilities from a one-step transition ma...
Analyze Newton-Raphson Convergence, Choose Sigma, and Derive Vega
Context You are given the market price of a European option and must infer the Black–Scholes implied volatility. This requires solving for the volatil...
Find the Expected Number of Record Maxima
A permutation of the distinct values 1 through 100 is revealed from left to right. Replace the current maximum whenever the revealed value is strictly...
Choose Randomization Unit and Mitigate Network Effects
Choose Randomization Unit and Mitigate Network Effects A/B Test Design for a New Messenger Feature with Network Effects Context You are designing an A...
Determine Probability of Video Selection and Impact Evaluation
Determine Probability of Video Selection and Impact Evaluation Video Recommendation Push: Selection Probabilities, Complements, and Design Choices Sce...
Understand Propensity Score Matching in Business Analytics
Understand Propensity Score Matching in Business Analytics Propensity Score Matching (PSM) in Observational Product Data Context You work on a growth ...
Calculate Expected Draws for X > 0.8 in Uniform(0,1)
Calculate Expected Draws for X > 0.8 in Uniform(0,1) Scenario Quick probability check during a first-round screen to gauge statistical intuition. Ques...
Analyze Central Limit Theorem in User Comment Distribution
Analyze Central Limit Theorem in User Comment Distribution Comments per User — CLT, Expectation, SD, and 95% CI Context You are measuring how many com...
Design Sampling Strategy to Estimate Fake News Proportion
Design Sampling Strategy to Estimate Fake News Proportion Estimating Fake News Prevalence and Impact on Facebook Context Management is concerned about...
Derive eigenvalues and sum for inverse matrix
Derive eigenvalues and sum for inverse matrix Eigenvalues of an Inverse and Their Sum Context Let A be an invertible n×n matrix (over the real or comp...
Explain derivatives, YTM, and core statistics
Explain derivatives, YTM, and core statistics evaluates statistical assumptions, formulas, estimation strategy, uncertainty, edge cases, and interpret...
How to derive correlation from variances
Deriving Correlation from Variances You have two random variables X and Y with finite second moments. You are given Var(X + Y) and Var(X). Answer the ...
Annotating and forecasting a long‑tail distribution
Annotating and Forecasting a Long-tail Distribution You are analyzing daily share counts across many pages on a social platform. The cross-sectional d...