AI, data and statistics

Statistics interview questions

Inference, study design, uncertainty and reproducible quantitative analysis.

9 questions, each with a worked answer

How is a confidence interval different from a p-value? Fundamentals Concept
When would you choose a nonparametric method? Intermediate Scenario
How does a confidence interval change with sample size and variance? Intermediate Concept
Why should the experimental unit determine your statistical test? Intermediate Scenario
What is the difference between statistical significance and practical importance? Advanced Concept
How would you approach multiple comparisons in an omics experiment? Advanced Troubleshooting
How would you explain the difference between a statistical estimand and the estimator used to calculate it? Intermediate Troubleshooting
You discover that samples were measured repeatedly per donor. How would you revise the analysis? Intermediate Troubleshooting
Design an analysis plan that separates confirmatory hypotheses from exploratory comparisons. Advanced Practical

About Statistics

Statistics turns noisy measurements into conclusions with an honest statement of uncertainty. It covers study design, estimation, hypothesis testing, confidence intervals and modelling. In biotech it decides sample sizes, separates effects from variation and keeps teams from over-reading a result.

Knowing which assumptions a method makes, and what to do when they fail, matters more than memorising tests.

Fundamentals: 1
Intermediate: 5
Advanced: 3

What these questions test

Design statistical studies: Plan sample sizes, comparisons and bias controls matched to objectives.
Quantify uncertainty: Choose analyses and intervals consistent with data and assumptions.

References

Common pitfalls and recommended practices. scikit-learn User Guide. scikit-learn.org/stable/common_pitfalls.html.
amstat.org/asa/files/pdfs/P-ValueStatement.pdf.
nature.com/articles/s41467-025-62616-x.
ncbi.nlm.nih.gov/books/NBK621595.
academic.oup.com/jrsssb/article/57/1/289/7035855.
pmc.ncbi.nlm.nih.gov/articles/PMC2817684.

Practice material written by TheBench.Bio and checked against the references above, reviewed October 23, 2026. Written to practise with, not collected from real interviews.