CompTIA Data+ (DA0-001) — Question 46

Which of the following describes the method of sampling in which elements of data are selected randomly from each of the small subgroups within a population?

Answer options

• A. Simple random
• B. Cluster
• C. Systematic
• D. Stratified

Correct answer: C

Explanation

The correct answer is D, as stratified sampling involves dividing the population into distinct subgroups and then randomly selecting samples from each of those subgroups. Simple random sampling selects individuals from the entire population without regard to subgroups, cluster sampling groups the population and selects entire clusters, and systematic sampling involves selecting elements at regular intervals.