I applied online. The process took 5 days. I interviewed at Lubrizol (Wickliffe, OH) in Oct 2025
Interview
Technical interview with two PhD level statisticians, 30 minutes long. Interview focuses on statistical concepts based around an analysis/case study scenario. The next interview is an hour long, same deal.
Interview questions [1]
Question 1
What is the difference between regression models and classification trees/random forests in terms of what they optimize?