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."
Measure Bird Species Segregation
You are a data scientist analyzing bird observations from a forest. The ecology team wants to know whether different bird species are spatially segreg...
Interpret Model Metrics, Regularization, and Resampling Fundamentals
Interpret Model Metrics, Regularization, and Resampling Fundamentals A screening discussion covers an imbalanced classifier with a 3 percent base rate...
Solve probability and game-theory puzzles
You are interviewing for a quant trading internship. Work through the following probability and game-theory puzzles. There is no need to answer instan...
Implement Bootstrap and Jackknife Estimates on a DataFrame
Implement bootstrap and jackknife uncertainty estimates for a statistic computed from a pandas DataFrame. Learn correct positional resampling, confide...
Choose the right test for proportions
A/B Test on Delivery Completion Rate (Binary Outcome) Context: You are evaluating an A/B test on a binary metric (delivered_bool). Treat each order as...
Connect Probability, Experiment Sizing, and Bootstrap Inference
Connect Probability, Experiment Sizing, and Bootstrap Inference A product team wants a precise statistical readout for a billboard-style intervention....
Solve estimation and probability brainteasers
This is a set of independent estimation and probability brainteasers of the kind asked rapid-fire from a slide deck. Treat each one separately. For ev...
Solve probability and expectation problems
You are asked to solve the following probability and mathematical interview problems: 1. Squid Game glass bridge: There are B sequential bridge steps....
How compare Waymo turning trajectories statistically
Problem You have aerial-drone data that records the 2D turning trajectories of vehicles passing through multiple intersections. Each trajectory corres...
Estimate weather’s effect on mental health
This question evaluates causal inference and applied statistical modeling skills—specifically defining outcomes and treatments, addressing confounding...
Assess Routing Experiment Validity
A ride-hailing team runs an A/B test in San Francisco in July 2024 for a new routing algorithm intended to reduce time to pickup, abbreviated TTP. You...
Commuter Ride-Choice Probability: Committed and Permanent Riders
This question tests a data scientist's ability to apply probability theory to multi-event, multi-day behavioral models, covering independence, complem...
Solve probability and stopping questions
This set of problems evaluates probabilistic reasoning and mathematical statistics skills, covering convolution for sums of independent variables, exp...
Explain Bootstrap and Statistical Inference
This question evaluates a data scientist's competence with resampling methods (bootstrap), uncertainty quantification and hypothesis testing (variance...
Why use the t-statistic?
This question evaluates understanding of the t-statistic as a standardized test measure connecting effect size, variance, and sample size, and probes ...
Solve Classic Probability Questions
This set evaluates probabilistic reasoning and expectation computation across topics such as sequential conditional survival, convolution of continuou...
Derive the Gambler's Ruin Probability
A gambler starts with i coins. Each round independently increases the fortune by one with probability p and decreases it by one with probability 1-p. ...
Answer core probability and statistics questions
Answer the following interview-style probability/statistics questions. Provide formulas and short explanations. 1) Bayes’ rule: State Bayes’ rule. Giv...
Can bootstrap help reduce variance
An interviewer asks: “Can bootstrap help reduce variance?” Answer this question precisely. Distinguish between: 1) Using the bootstrap to estimate var...
Compute Parking Clustering Probability and P-Value
This question evaluates combinatorial probability and hypothesis-testing skills, specifically counting-based calculation of exact probabilities under ...