Why is the t-statistic useful
Quick Overview
This question evaluates understanding of the t-statistic and broader statistical inference competencies, focusing on interpreting effect size relative to sampling variability in hypothesis testing.
Two Sigma
Feb 13, 2026, 3:44 PM
Data Scientist
Technical Screen
Statistics & Math
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In classical hypothesis testing (e.g., a one-sample or two-sample mean test), explain:
Question
- What is the t-statistic and how is it computed?
- Why is the t-statistic considered a good measure for testing whether an effect is real (i.e., not just noise)?
- What assumptions are typically required for the t-test/t-statistic to be valid, and what are common failure modes?
Solution
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