This brief guide covers SIG (Susquehanna) Statistics & Math interview questions and how to approach interview preparation. SIG's interviews are distinctive because they evaluate pure mathematical thinking applied to fast decision-making: many problems look like math-competition puzzles but are framed with trading intuition, expected value, and sequential decision-making. Expect probability, combinatorics, conditional probability, basic statistical reasoning, and mental arithmetic to appear in online assessments and technical calls. Interviewers are assessing speed, correctness, clarity of reasoning, and how you convert math into actionable judgments under uncertainty. Prepare by practicing timed problem sets that mirror one-hour online assessments and 30–60 minute technical interviews. Focus on probability puzzles, combinatorics, simple inference, distributions, estimation, and expected-value reasoning while sharpening mental math. Practice explaining assumptions, writing concise stepwise solutions, and making decisions from numeric answers (for example, when to trade or pass). Simulate interviewer follow-ups so you can defend and iterate on solutions. Also be ready to connect statistical ideas to practical trade outcomes and to demonstrate collaborative communication and curiosity.