CompTIA Data+ DA0-002 (V2) Practice Question

The correct answer is Sampling. Sampling is the technique of selecting a subset of individuals from within a statistical population to estimate the characteristics of the whole population. This method is ideal for the scenario because it allows the company to gather representative feedback in a cost-effective and timely manner, which would be impractical with a population of 500,000 users.

• A census is incorrect because it involves collecting data from every single member of a population. In this scenario, that would mean surveying all 500,000 users, which the analyst is explicitly trying to avoid due to cost and time constraints.
• ETL (Extract, Transform, Load) is a data integration process used to collect data from various source systems, transform it, and load it into a target database like a data warehouse. It is used for managing existing data, not for collecting new, primary data from users through a survey.
• Data augmentation is a technique used to artificially increase the size of a dataset by creating modified copies of existing data. It is a data transformation method, often used in machine learning, and is not a method for collecting primary data from people.