DA0-002 Data Concepts and Environments Practice Question
Exhibit
Column: Age Null Count: 50 Unique Values: 23 Min: 0 Max: 150 Mean: 45.2 Median: 42
Refer to the exhibit. Based on the data profiling results, what is a likely data quality issue?
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
✓
Validity
The min of 0 and max of 150 are biologically implausible for age. A 0-year-old or 150-year-old customer likely indicates invalid data, affecting validity.
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
Incorrect. Completeness is about missing data; null count is given but not the main issue.
- ✗
Accuracy
Why it's wrong here
Incorrect. Accuracy relates to truthfulness, but validity checks format/range first.
- ✓
Validity
Why this is correct
Correct. Values like 0 and 150 violate reasonable constraints.
- ✗
Consistency
Why it's wrong here
Incorrect. Consistency concerns contradictions across records.
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Written by Johnson Ajibi, MSc IT Security
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