Scenario

You have trained a regression model and need to explain whether its performance is good enough to use. The interviewer wants to hear how you would assess error, compare models, and decide if the model is reliable.

Question

How would you evaluate a regression model?

Use a practical example such as predicting Pratt & Whitney engine shop visit turnaround time. The target is continuous, the output affects planning decisions, and both overprediction and underprediction have business cost.