DA0-002 Data Analysis Practice Question
A data analyst is cleaning a customer dataset. Which two actions are appropriate for handling duplicate records? (Choose TWO)
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
✓
Remove all rows with identical values in every field
Removing exact duplicates and standardizing identifiers help resolve duplicates.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Impute missing values with mean
Why it's wrong here
Imputation is for missing values, not duplicates.
- ✗
Delete any row with a duplicate email address
Why it's wrong here
Deleting based on one field may remove legitimate records; should be investigated.
- ✓
Remove all rows with identical values in every field
Why this is correct
Exact duplicates can be removed safely.
- ✗
Apply Z-score standardization
Why it's wrong here
Standardization is for scaling, not deduplication.
- ✓
Use a fuzzy matching algorithm to identify near-duplicates
Why this is correct
Fuzzy matching detects similar but not identical records.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DA0-002 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 DA0-002 exam.