Estimation Confidence Intervals Interview Guide
Estimation confidence intervals interview guide for point estimates, uncertainty ranges, calibration, updates, and communication.
Candidates who need better range communication in Fermi and market-making prompts.
A range communicates uncertainty
Open-ended estimation rarely deserves one fake-precise number. A range tells the interviewer how uncertain you are and gives room for updates.
Confidence is informal unless specified
In many interviews, a confidence interval is a communication device rather than a formal statistical interval. Say what confidence level you intend.
Concrete example
If estimating daily visitors to a venue, a 50 percent confidence range should be much narrower than a 90 percent range. Wider confidence means more coverage.
Update after information
When the interviewer gives a benchmark, narrow or shift the range explicitly. Explain whether the new information changes the center, the uncertainty, or both.
Common mistakes
Candidates often give narrow ranges to sound confident. If your intervals miss often in practice, widen them and improve decomposition.
Practice the pattern
Use the LeetQuidity curriculum and calibration to turn this topic into a focused practice plan.