Question 4

Question

Question 4

BlackTom AI · Accepted Answer

Decision trees are valued for their clear, rule‑based structure and visual representation, so option d is correct.

1. Relevant knowledge points and concepts
- Interpretability: decision trees map features to decisions via simple if–then rules and a plotted tree, making them easy for humans to follow.
- Sensitivity/instability: trees are high‑variance models; small data changes can alter splits.
- Overfitting: unpruned trees can perfectly fit training data and generalize poorly.
- Accuracy: performance depends on data; ensembles (random forest/boosting) often outperform a single tree.

2. Step‑by‑step reasoning
- Option a claims small changes never affect the learned tree. Because split thresholds are chosen greedily, a slight shift in training examples can change which split is optimal, so a is false.
- Option b claims trees are guaranteed not to overfit. In practice, fully grown trees commonly overfit unless pruned or regularized, so b is false.
- Option c claims they always produce the most accurate model. Accuracy depends on data complexity; many real problems benefit from ensembles or other algorithms, so c is false.
- Option d states trees are relatively easy for humans to understand and interpret. Each path from root to leaf corresponds to a straightforward rule, and the graphical form is intuitive, so d is true.

3. Calculations
- No numeric computations are required for this conceptual question.

4. Why the correct answer is correct
- Decision trees produce explicit decision rules and a hierarchical visualization, which align closely with human reasoning (e.g., “if age > 30 and income > X, then …”). This transparency is the principal advantage and the core reason d is correct.

5. Why other options are incorrect (brief)
- a is false due to tree instability; b is false because trees can overfit; c is false because other models or ensembles can yield higher accuracy.

6. Conclusion
- Therefore the correct choice is d. This matches the provided answer: "d. They are relatively easy for humans to understand and interpret."

Question 4单项选择题

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