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8 branches of analytics, product and AI interview questions
Explore eight skill tracks, called branches, filterable by subtopic, company, tool and difficulty. SQL questions run against sample tables, choice and numeric answers are checked instantly, and written cases are scored against evaluation criteria.
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17 questions
What a 95% interval actually says
Distinguish the frequentist claim from the common misreading.
Quick check · Intervals · 6 min · Medium
Statistics & Inference · Original Uplift question
Effect of halving the MDE
Reason about the sample size / MDE relationship.
Calculation · Intervals · 5 min · Easy
Statistics & Inference · Original Uplift question
A confounded coupon coefficient
ProExplain a positive coefficient that cannot be causal.
Written case · Regression · Python · 15 min · Medium
Statistics & Inference · Original Uplift question
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.
Written case · Communicating stats · 8 min · Medium
Statistics & Inference · Company-context scenario
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.
Quick check · Foundations · 6 min · Easy
Statistics & Inference · Company-context scenario
Type I vs Type II error trade-off
A medical screening test is being tuned.
Quick check · Intervals · 5 min · Easy
Statistics & Inference · Company-context scenario
Positive test, rare disease
ProA disease affects 1% of a population.
Calculation · Bayesian reasoning · 10 min · Hard
Statistics & Inference · Company-context scenario
The returning-planes problem
In WWII, analysts studied bullet holes on planes that RETURNED from missions and proposed armoring the most-hit areas.
Quick check · Bias · 5 min · Easy
Statistics & Inference · Company-context scenario
Bias-variance trade-off
ProA model has near-perfect training accuracy but poor test accuracy.
Quick check · Modeling intuition · 6 min · Medium
Statistics & Inference · Company-context scenario
Two children, at least one boy
ProA family has two children.
Calculation · Probability puzzles · 6 min · Medium
Statistics & Inference · Company-context scenario
When the mean misleads
You report 'average revenue per user = $50' but leadership is confused because almost no one spends near $50.
Quick check · Descriptive stats · 5 min · Easy
Statistics & Inference · Company-context scenario
Which test for which data
ProYou're comparing two groups.
Quick check · Hypothesis testing · 6 min · Medium
Statistics & Inference · Company-context scenario
Is 550 heads in 1,000 flips suspicious?
A coin is flipped 1,000 times and lands heads 550 times.
Calculation · Intervals · 10 min · Medium
Statistics & Inference · Reported at D. E. Shaw
Expected minimum of two uniforms
ProLet X and Y be independent Uniform(0,1) random variables.
Calculation · Probability puzzles · 15 min · Hard
Statistics & Inference · Reported at Google
Inference with severely skewed revenue
Customer revenue is zero for many users and has a very long right tail.
Written case · Regression · 15 min · Medium
Statistics & Inference · Reported interview question
Positive predictive value of a screening test
A condition affects 1% of a population.
Calculation · Probability puzzles · 10 min · Medium
Statistics & Inference · Reported interview question
Control four confirmatory tests
A product experiment has four equally important confirmatory metrics.
Quick check · Intervals · 7 min · Easy
Statistics & Inference · Reported interview question