Correct Answer: C

Boosting is a method in ensemble learning where multiple models are trained sequentially. Each subsequent model in the sequence focuses on the errors made by the previous models. By doing this, the ensemble aims to improve the accuracy by concentrating on the most difficult cases in the training dataset.

Why not the others?

• A: This option describes a scenario where models are trained on distinct subsets of data, which doesn't accurately depict boosting. In boosting, each model focuses on the errors of the previous models.
• B: This option describes a complex process that combines elements of bootstrapping and feature engineering, but it does not accurately describe boosting.
• D: This describes bagging, not boosting. Bagging involves training models independently on bootstrapped samples of the data and then combining their predictions.
• E: In boosting, the size of the sample for each model typically remains consistent; it's the focus on errors that changes.

Boosting is particularly effective because it continuously adapts to the complexities of the data by giving more weight to instances that are harder to predict, thereby improving the overall predictive power of the ensemble.