CompTIA Data+ DA0-002 (V2) Practice Question

The correct answer is Augmentation. Augmentation is the process of adding new data to an existing dataset to enrich it, often by joining it with an external data source. In this scenario, the analyst is adding external demographic data to the internal sales data to provide more context for analysis.

• Creating a derived variable is incorrect because it involves generating new data from columns that already exist within the dataset, such as calculating profit from sales and cost columns. It does not involve incorporating external data.
• Imputation is incorrect. This technique is used to fill in missing values within a dataset, not to add new features or information from an outside source.
• Standardization is a scaling technique used to transform numerical data to have a mean of zero and a standard deviation of one. It does not add new contextual information to the dataset.