CompTIA Data+ DA0-002 (V2) Practice Question

The correct answer is Incompleteness. Data completeness is a data quality dimension that measures whether all necessary data is present in a dataset. In this scenario, the postal_code is a required field for the direct mail campaign, and its absence in 30% of records makes the dataset incomplete for the intended business purpose.

• Duplication is incorrect because it refers to the same record appearing multiple times in a dataset. The problem described is missing data within records, not repeated records.
• Redundancy is incorrect as it refers to the same data being stored in multiple places, which can lead to inconsistencies but is not the issue here.
• Outliers are incorrect because they are data points that are present but deviate significantly from the other observations. The issue identified is the absence of data (null values), not the presence of abnormal data.