DA0-002 Data Acquisition and Preparation Practice Question
A data analyst is profiling a new dataset containing customer information. When assessing data quality, which metric would be most appropriate to determine if the 'email' column contains valid email addresses?
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
✓
Pattern analysis
Pattern analysis (e.g., using regular expressions) can validate whether strings match the expected format of an email address. Row counts, null counts, and cardinality do not validate format.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Pattern analysis
Why this is correct
Pattern analysis can verify if values match the typical email format.
- ✗
Null count
Why it's wrong here
Null count identifies missing values but not invalid formats.
- ✗
Cardinality
Why it's wrong here
Cardinality counts distinct values; it does not check format.
- ✗
Row count
Why it's wrong here
Row count only tells how many rows exist, not the validity of data.
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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.