AWS Certified Machine Learning – Specialty — Question 5

A Machine Learning Specialist trained a regression model, but the first iteration needs optimizing. The Specialist needs to understand whether the model is more frequently overestimating or underestimating the target.
What option can the Specialist use to determine whether it is overestimating or underestimating the target value?

Answer options

• A. Root Mean Square Error (RMSE)
• B. Residual plots
• C. Area under the curve
• D. Confusion matrix

Correct answer: B

Explanation

Residual plots visualize the differences between observed and predicted values, allowing the Specialist to see patterns in overestimations and underestimations. RMSE provides a measure of the model's prediction error but does not indicate the direction of the errors. The Area under the curve is used for classification tasks, and the Confusion matrix is also not relevant for regression analysis.