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."
Test if one value comes from N(μ,σ²)
This question evaluates understanding of hypothesis testing and statistical inference, specifically the formulation and interpretation of a z-statisti...
Test conversion difference and adjust for clustering
Using aggregated results for the 7‑day window 2025‑08‑26..2025‑09‑01, evaluate statistical significance and power for conversion uplift, accounting fo...
Compute posterior and predictive coin probabilities
Bayesian coin: posterior, prediction, and stopping-time expectation Context - You have two coins and will use the same coin for all flips: - Fair co...
Optimize red-ball draw probability, prove optimality
This question evaluates probabilistic reasoning, optimization and mathematical proof skills by asking how to allocate red and blue balls across two bo...
Estimate billboard reach and impressions
Digital Billboard: Weekly Reach, Impressions, and Store-Visit Attribution Context You are estimating the performance of a single digital billboard bes...
Price a coin-doubling game rationally
Coin-Doubling (St. Petersburg) Game: EV, Log-Utility Pricing, Kelly Staking, and House Cap Context and assumptions - Single play: You buy one ticket t...
Explain P-Value Reporting and Bootstrap for Coefficient Estimation
Explain P-Value Reporting and Bootstrap for Coefficient Estimation Scenario Technical screen — statistical inference checks after regression. Question...
Estimate Highway Billboard Impressions Using Traffic Data
Estimating Highway Billboard Reach and Impressions An out-of-home advertising team wants to estimate reach and impressions for a single highway billbo...
Calculate Posterior Probability Using Bayes' Theorem Example
Bayes' Theorem: Spam-Flag Posterior You are evaluating a simple classifier that flags messages as spam. From historical data you know the spam prevale...
Derive mean and variance of x̄
This question evaluates understanding of expectation, variance, covariance structure, and how dependence between observations affects the precision of...
Find next terms in sequences
Pattern Recognition: Find the Rule and Next Term You are given 8 number sequences. For each sequence: - Identify a clear rule that generates the terms...
Solve animals-and-legs count
Barn Legs Puzzle (Linear Equations) Convert the word problem into a small system of linear equations and solve. You have a barn with three types of an...
How do you compute expected return for two projects?
This question evaluates a candidate's ability to compute expected return and net present value by modeling probabilistic outcomes, cash flows, discoun...
Determine Claim Rate for Breakeven in Insurance Portfolio
Weather-Insurance Portfolio Profitability You price a 12-month weather insurance policy. Customers pay premiums upfront for the year. Each policy can ...
What are sum expectation and variance?
Let random variables X and Y have finite means and variances. How do you compute: 1. The expectation of X + Y 2. The variance of X + Y Your answer sho...
How to Analyze and Reduce Airline Flight Delays
How to Analyze and Reduce Airline Flight Delays Scenario Statistics role-play: investigating airline flight delays Task Design and execute a statistic...
Analyze profits under random walk and Brownian motion
Analyze profits under random walk and Brownian motion Random-Walk Trading Rules: Expectation and Variance Setup - Let (S_t) be a simple random walk fo...
Match Netflix profit; derive required subscribers
Subscription Profit and Break-even (All Monthly) Assume all figures are monthly and "M" denotes millions. We model subscription profit as: - Profit = ...
Test a coefficient and explain t-distribution
In OLS, test whether feature j is relevant. a) State H0: β_j = 0 versus H1: β_j ≠ 0 and construct the t‑statistic t_j = b̂_j / se(b̂_j), giving the ex...
Compute sample sizes and error control
Using the Biker experiment context, compute required sample sizes and describe error control under practical constraints. Show formulas and numeric an...