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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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9 questions
Sample size for a 2% lift
Compute the per-arm sample size for a conversion test.
Calculation · Design · 8 min · Medium
Experimentation & A/B Testing · Original Uplift question
Why peeking inflates false positives
Explain the statistical cost of checking results daily.
Quick check · Readout · 5 min · Easy
Experimentation & A/B Testing · Original Uplift question
Big week-1 lift that fades to zero
A redesigned button shows +8% engagement in week 1, but by week 4 treatment and control are indistinguishable.
Quick check · Readout · 5 min · Easy
Experimentation & A/B Testing · Company-context scenario
Sample size for a 1-point conversion lift
Baseline conversion is 10%.
Calculation · Design · 8 min · Medium
Experimentation & A/B Testing · Original Uplift question
A 50/50 split that came out 52/48
You designed a 50/50 experiment.
Quick check · Data quality · 6 min · Medium
Experimentation & A/B Testing · Company-context scenario
A PM wants to ship the moment p < 0.05
A PM watches the experiment dashboard daily and wants to ship as soon as it crosses p < 0.05.
Written case · Readout · 12 min · Medium
Experimentation & A/B Testing · Company-context scenario
Test a new shoppable-ad ranking model
Meta has a new ranking model for shoppable-feed ads.
Written case · Design · 20 min · Medium
Experimentation & A/B Testing · Reported at Meta
Spot a novelty effect in a VR interface test
A new VR interface lifts daily use by 18% in days 1–3, 7% in days 4–7, and 0% in days 8–21.
Quick check · Readout · 7 min · Easy
Experimentation & A/B Testing · Reported at Meta
False-positive risk across four variants
You compare four independent treatment variants with one control.
Calculation · Design · 10 min · Medium
Experimentation & A/B Testing · Reported interview question