Explain instrumental variables with an example
Last updated: April 28, 2026
Quick Overview
Explain instrumental variables in simple terms and provide a concrete example.
Booking.com
April 28, 202614
4
2,860 solved
Explain instrumental variables in simple terms and provide a concrete example.
Statistics questions at Booking.com test your ability to reason quantitatively and design rigorous experiments. This Phone Screen question evaluates your understanding of statistical inference and its application to business decisions.
What the Interviewer Expects
- State the correct formula or theorem with clear definitions
- Apply the concept to the given scenario step by step
- Interpret the result in plain language
- Identify assumptions and when they might be violated
Key Topics to Cover
How to Approach This
- Define your hypotheses (H0 and H1) clearly before performing any test.
- Calculate required sample size BEFORE running an experiment, using power analysis.
- Remember the Central Limit Theorem: sample means become approximately normal with large n.
- Watch for Simpson's paradox. Always segment data by key dimensions.
- Distinguish between statistical significance and practical significance.
Possible Follow-up Questions
- How would you handle multiple comparisons?
- What assumptions does this test make, and how would you validate them?
- How would you explain this result to a non-technical audience?
- What if the sample size is very small?
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