AI0-001 AI Concepts and Foundations Practice Question
Which metric is most appropriate for evaluating a binary classification model where the positive class is rare and false positives are costly?
⚠ Common exam trap
CompTIA often tests the misconception that accuracy is always the best metric, but the trap here is that candidates overlook how class imbalance and asymmetric costs make precision or recall more relevant, and they fail to distinguish between F1-score and precision when the cost of false positives is explicitly stated.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Precision
Precision is the most appropriate metric when the positive class is rare and false positives are costly because it measures the proportion of true positive predictions among all positive predictions. In this scenario, minimizing false positives is critical, and precision directly penalizes them by requiring high confidence before labeling an instance as positive. This aligns with the business need to avoid costly false alarms, such as in fraud detection or medical diagnosis for rare diseases.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Accuracy
Why it's wrong here
Incorrect; accuracy can be high even if all positives are missed in rare class scenarios.
- ✗
F1-score
Why it's wrong here
Incorrect; F1 balances precision and recall, but precision alone is prioritized when false positives are costly.
- ✓
Precision
Why this is correct
Correct; precision measures how many predicted positives are actually positive, reducing false positives.
- ✗
Recall
Why it's wrong here
Incorrect; recall measures how many actual positives are captured, not false positive control.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AI0-001 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AI0-001 exam.