DA0-002 Data Analysis Practice Question
A dataset contains customer records with a column for 'Phone Number' that should be unique. However, the analyst finds several duplicate phone numbers. Which data quality dimension is primarily affected?
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
✓
Uniqueness
Uniqueness refers to the expectation that each record or attribute value should be unique. Duplicate phone numbers violate uniqueness.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Completeness
Why it's wrong here
Completeness refers to missing data.
- ✗
Accuracy
Why it's wrong here
Accuracy refers to correctness of values.
- ✓
Uniqueness
Why this is correct
Correct: duplicates violate uniqueness.
- ✗
Consistency
Why it's wrong here
Consistency refers to uniformity across data sources.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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