[熱身賽第二輪] 評估分類系統(1) [Warm-up Round 2] Evaluating Classification Systems (1)

Big Concept: Evaluating Classification Systems Topic: Why 99% Accuracy Can Still Be a Bad Model Bloom's Taxonomy: understand, remember Learning Goal: Explain why accuracy alone can be misleading on imbalanced datasets, and describe a case where a 99% accurate model is still not useful. Key Learning Points: class imbalance; majority-class baseline