Statistics
45 practice items · needed by 14 roles
Easy 10Medium 12Hard 23
Coding problems
Practice questions
- Standard error of a sample meaneasy
- Positive test for a rare conditionmedium
- Is a 4-point gain realhard
- What the central limit theorem sayseasy
- Click-through rate standard errorshard
- Error spread grows with the predictionhard
- When the bootstrap breaks downhard
- Reading a KS drift statisticmedium
- Correlation and causationeasy
- Median of an even-sized listeasy
- Type of a 1 to 5 ratingeasy
- Which set has more spreadeasy
- What a p-value meansmedium
- Outlier cutoff with the IQR rulemedium
- Average price across two storesmedium
- Reading a 95% confidence intervalmedium
- False positive in an A/B testmedium
- Z-score of a branchmedium
- Overall rate goes the other wayhard
- Stopping a test earlyhard
- Detecting a small lifthard
- PERCENTILE_CONT vs PERCENTILE_DISChard
- How reliable is a fraud flaghard
- Randomised by user, analysed by sessionhard
- Halving the margin of errorhard
- Worst stores improved on their ownhard
- Correlation near zerohard
- Grand total of an average pivothard
- Combining two store medianshard
- What a p-value meansmedium
- Detecting a smaller effectmedium
- Checking results every daymedium
- Up overall, down everywherehard
- Twenty metrics, one winnerhard
- A positive but uncertain resulthard
- How long will the test takehard
- What 95% significance meansmedium
- Stopping an A/B test too earlyhard
- How big must the test be?hard
- Testing five variants at oncehard