Data Analyst
Statistics and probability questions
41 questions on Statistics and probability for data analysts, easiest first.
Easy 7
Medium 12
- 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
- Why use a 7-day moving averagemedium
- Z-score of a branchmedium
- Typical salary on a dashboardmedium
- Diwali in different monthsmedium
- A daily chart that jumps aroundmedium
- A histogram that hides two groupsmedium
- Why a 7-day moving averagemedium
Hard 22
- 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
- Comparing a week to last yearhard
- Better in every segment, worse overallhard
- A store with 100% conversionhard
- Error bars that overlaphard
- Is today's spike unusualhard
- A moving average that reacts latehard
- Churn shown as 4.2817%hard
- Gaps in time squeezed outhard
- Month-on-month swings during Ramadanhard
- Worst stores improved after coachinghard
- Income bands of different widthshard