AI0-001 AI Models and Data Engineering Practice Question
A financial institution is training a risk assessment model. The dataset includes customer credit scores, income, age, and past loan defaults. During feature engineering, a data engineer creates a new feature 'income_to_debt_ratio'. Which type of feature engineering technique is this?
⚠ Common exam trap
CompTIA often tests the distinction between feature engineering techniques by presenting a derived feature and expecting candidates to recognize it as feature combination rather than confusing it with scaling or encoding.
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
✓
Feature combination
'income_to_debt_ratio' is created by combining two existing features (income and debt) into a single derived feature. This is a classic example of feature combination (also known as feature crossing or feature construction), where arithmetic operations or logical rules are applied to existing variables to generate new predictive signals. The goal is to capture interactions or relationships that the original features alone may not express linearly.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Feature encoding
Why it's wrong here
Encoding transforms categorical variables into numerical, not a ratio of two features.
- ✗
Feature scaling
Why it's wrong here
Scaling changes the range of values, not creates new features from multiple variables.
- ✗
Feature selection
Why it's wrong here
Selection chooses a subset of existing features, not creates new ones.
- ✓
Feature combination
Why this is correct
Creating a ratio from two continuous variables is a combination technique to capture interaction.
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JA
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.