DA0-002 Data Acquisition and Preparation Practice Question
A data analyst is performing data profiling on a customer table. Which metric would best help identify missing values in the 'phone' column?
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
✓
Null count
Null count directly measures missing values.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cardinality
Why it's wrong here
Cardinality counts distinct values, not nulls.
- ✓
Null count
Why this is correct
Null count shows number of records with missing phone values.
- ✗
Mean
Why it's wrong here
Mean is for numeric data, not applicable to phone.
- ✗
Row count
Why it's wrong here
Row count gives total rows, not missing values.
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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.