Branch
Statistics & Inference interview questions
Distributions, intervals, regression intuition and error tradeoffs.
17 practice questions · 10 subtopics · hints and unlimited attempts
What this branch covers
Intervals & Errors
Confidence, power, type I/II tradeoffs.
Intervals & Errors questionsRegression Intuition
Coefficients, confounding, collinearity.
Regression Intuition questionsCommunicating Stats
Explaining uncertainty and results to non-technical partners.
Communicating Stats questionsFoundations
Distributions, expectation and the core statistical vocabulary.
Foundations questionsBayesian Reasoning
Priors, base rates and updating beliefs with evidence.
Bayesian Reasoning questionsBias
Selection, survivorship and measurement bias in real data.
Bias questionsModeling Intuition
Bias-variance, overfitting and model choice judgment.
Modeling Intuition questionsProbability Puzzles
Short probability problems used as interview screens.
Probability Puzzles questionsDescriptive Stats
Means, medians, spread and skew in practice.
Descriptive Stats questionsHypothesis Testing
Choosing tests, reading p-values and power correctly.
Hypothesis Testing questions
All Statistics & Inference questions
What a 95% interval actually says
Distinguish the frequentist claim from the common misreading.
Intervals & Errors · multiple choice · medium · 6 min
Effect of halving the MDE
Reason about the sample size / MDE relationship.
Intervals & Errors · numeric · easy · 5 min
A confounded coupon coefficient
ProExplain a positive coefficient that cannot be causal.
Regression Intuition · scenario · medium · 15 min
Explain a p-value to a non-technical exec
A VP asks 'what does p = 0.03 actually mean?' Explain it correctly in plain language, and state clearly what it does NOT mean.
Communicating Stats · scenario · medium · 8 min
What the Central Limit Theorem lets you do
Why does the Central Limit Theorem matter for A/B testing, where the underlying metric (e.g.
Foundations · multiple choice · easy · 6 min
Type I vs Type II error trade-off
A medical screening test is being tuned.
Intervals & Errors · multiple choice · easy · 5 min
Positive test, rare disease
ProA disease affects 1% of a population.
Bayesian Reasoning · numeric · hard · 10 min
The returning-planes problem
In WWII, analysts studied bullet holes on planes that RETURNED from missions and proposed armoring the most-hit areas.
Bias · multiple choice · easy · 5 min
Bias-variance trade-off
ProA model has near-perfect training accuracy but poor test accuracy.
Modeling Intuition · multiple choice · medium · 6 min
Two children, at least one boy
ProA family has two children.
Probability Puzzles · numeric · medium · 6 min
When the mean misleads
You report 'average revenue per user = $50' but leadership is confused because almost no one spends near $50.
Descriptive Stats · multiple choice · easy · 5 min
Which test for which data
ProYou're comparing two groups.
Hypothesis Testing · multiple choice · medium · 6 min
Is 550 heads in 1,000 flips suspicious?
A coin is flipped 1,000 times and lands heads 550 times.
Intervals & Errors · numeric · medium · 10 min
Expected minimum of two uniforms
ProLet X and Y be independent Uniform(0,1) random variables.
Probability Puzzles · numeric · hard · 15 min
Inference with severely skewed revenue
Customer revenue is zero for many users and has a very long right tail.
Regression Intuition · scenario · medium · 15 min
Positive predictive value of a screening test
A condition affects 1% of a population.
Probability Puzzles · numeric · medium · 10 min
Control four confirmatory tests
A product experiment has four equally important confirmatory metrics.
Intervals & Errors · multiple choice · easy · 7 min
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