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."
Choose and compute correct t-test
A/B Test: Watch Time per Impression (seconds) You ran an experiment with two independent groups and want to assess whether the new experience increase...
Interpret p=0.10 rigorously
A/B Test on Monthly Churn: Inference, Power, and Testing Choices You ran a 28-day A/B test to reduce monthly churn among subscribers, randomizing 150,...
Maintain profit margin with new product line
Year 2 volume needed to maintain Year 1 profit margin after adding Vegan line Context - m denotes million dollars. - In Year 2, you add a Vegan burger...
Estimate fake-account prevalence with capture-recapture
This question evaluates a data scientist's competency in capture–recapture estimation, estimation of population size with incomplete detections, stati...
Determine distribution of aX+b when X~N(0,1)
This question evaluates understanding of affine transformations of the normal distribution, moment calculation, and probability density manipulation, ...
Explain p‑values to a product manager
Interpreting a Two-Sided A/B Test p-value of 0.03 You ran a two-sided A/B test on conversion rate. Results: - Baseline (control) conversion: 5.0% - Ob...
Prove and apply statistical ML fundamentals
Technical ML/Statistics Exercises (with precise math and small computations) Assume a standard supervised learning setting with n samples, p features,...
Answer core probability and inference questions
This question evaluates understanding of statistical inference and probability fundamentals, covering the Central Limit Theorem, p-values, Type I and ...
Explain and interpret p-values correctly
This question evaluates statistical inference and experimental-design competencies, focusing on a precise definition and correct interpretation of p-v...
Estimate percentile from buckets
You are given an approximate histogram of search-query frequencies. Each bucket i is represented as (left_bd_i, right_bd_i, bucket_count_i), where buc...
Derive a CDF from a PDF
This question evaluates a candidate's understanding of the relationship between probability density functions and cumulative distribution functions, i...
Update Box Probabilities After Drawing Red Balls
Three boxes are equally likely to be selected: - Box A contains two red balls. - Box B contains one red and one blue ball. - Box C contains two blue b...
Derive the Long-Run Sex Ratio Under a Stopping Rule
Assume each child is independently equally likely to be a girl or a boy. Every family continues having children until its first boy, then stops. For a...
Prove Equal Probability Impossible with Relabeled Dice Faces
Prove Equal Probability Impossible with Relabeled Dice Faces Uniform Sums from Two Relabeled Fair Dice Setup You have two fair six-sided dice. You may...
Calculate Particle Survival Probability After Time t
Calculate Particle Survival Probability After Time t Radioactive-Decay Style Probability Context You have 100 identical, independent particles. Each p...
Answer Statistics Questions for Spokeo DS Role Quiz
Answer Statistics Questions for Spokeo DS Role Quiz Timed Statistics Quiz: Short-Answer Concepts Answer the following independent questions succinctly...
Identify Probability of Request Originating from Bad User
Identify Probability of Request Originating from Bad User Measuring Abuse in Friend-Requests: Bayes, Identification, and Precision Scenario A social-n...
Calculate Expected Flips for Two Heads Coin Toss
Calculate Expected Flips for Two Heads Coin Toss Scenario Experian DataLabs online assessment – core probability section. Several short probability pr...
Explain Central Limit Theorem and Its Limitations
Explain Central Limit Theorem and Its Limitations Statistics Concepts and Disease-Test Evaluation Context You are assessing core statistical concepts ...
Analyze View Distribution and Recommendation Overlap in Videos
Analyze View Distribution and Recommendation Overlap in Videos Short-Video Platform: View Distribution and Recommendation Overlap Context You are anal...