Problems

118 curated questions across 15 topics, each with hints and a worked solution, including at 24 firms.

– of 118 solved

Easy –/53Medium –/52Hard –/13

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13 results

Statistics & Statistical Inference

Easy#7
Is the Coin Fair?
Statistics · Numerical · 4 min
Medium#8
Why Divide by n − 1?
Statistics · Free response · 12 min
Medium#9
Regressing Both Ways
Statistics · Numerical · 6 min
Easy#76
Uncorrelated but Not Independent
Two Sigma
Statistics · Free response · 5 min
Medium#87
Range of the Third Correlation
Citadel
Statistics · Multiple choice · 6 min
Medium#89
Best Guess from a Noisy Signal
Citadel · Susquehanna (SIG)
Statistics · Numerical · 6 min
Easy#90
Mean of a Lognormal
Citadel
Statistics · Numerical · 3 min
Hard#91
From Correlation to Win Rate
Citadel
Statistics · Numerical · 10 min
Medium#92
Duplicating Your Regression Data
Point72 · J.P. Morgan
Statistics · Multiple choice · 5 min
Easy#95
At Least 220 Heads in 400 Flips
Goldman Sachs · Squarepoint Capital
Statistics · Numerical · 4 min
Easy#101
Best-Fit Line Through Three Points
Squarepoint Capital
Statistics · Numerical · 4 min
Medium#106
Seven Dice Between 17 and 27
Five Rings
Statistics · Numerical · 4 min
Easy#117
Correlated Predictors in a Regression
Two Sigma
Statistics · Free response · 5 min