Decision Trees DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Which pruning approach builds the complete tree first and then removes branches that do not improve performance on a validation set?

   • AMinimum depth pruning
   • BEarly stopping
   • CPre-pruning
   • DPost-pruning
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   What is a decision path in a decision tree?

   • AThe order in which features are ranked by importance
   • BThe set of all leaf nodes in the tree
   • CThe training data used to build the tree
   • DThe sequence of splits from the root node to a leaf node
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   Which of the following is a key advantage of decision trees compared to many other machine learning models?

   • AThey require extensive feature scaling before training
   • BThey are immune to overfitting
   • CThey are highly interpretable and can be visualized as a set of if-then rules
   • DThey always achieve higher accuracy than neural networks
   Reveal Solution Discussion Select an answer first
5. 14application · medium

   A company needs to build a model to approve or deny small business loans. The model must be explainable to regulators, and the dataset contains both numerical and categorical features. Which approach would best meet the explainability requirement while still providing good predictive performance?

   • AUse a deep neural network and rely on post-hoc explanations like SHAP.
   • BUse a single decision tree and present the decision paths as rules.
   • CUse a support vector machine with a linear kernel.
   • DUse a random forest and average the feature importances.
   Reveal Solution Discussion Select an answer first
6. 15foundation · easy

   What is a common limitation of decision trees that can be mitigated by pruning or using ensemble methods?

   • AHigh bias
   • BRequirement of large amounts of memory
   • COverfitting
   • DInability to handle numerical features
   Reveal Solution Discussion Select an answer first