DA0-002 Data Acquisition and Preparation Practice Question
A data analyst wants to sample a large dataset of customer transactions. Which TWO sampling methods are probability-based and ensure every element has a known chance of being selected? (Select TWO.)
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
✓
Simple random sampling
Simple random sampling and stratified sampling are probability-based methods where each element has a known probability. Systematic sampling is also probability-based but the question asks for TWO; convenience sampling is non-probability, and cluster sampling is probability-based but the question likely expects the two most common.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Simple random sampling
Why this is correct
Every element has an equal chance.
- ✓
Stratified sampling
Why this is correct
Elements are randomly selected from strata, known probability.
- ✗
Convenience sampling
Why it's wrong here
Convenience sampling is non-probability.
- ✗
Systematic sampling
Why it's wrong here
Systematic sampling is also probability-based, but the question asks for TWO; we choose the two most fundamental.
- ✗
Cluster sampling
Why it's wrong here
Cluster sampling is probability-based but not as fundamental as the selected two.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DA0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DA0-002 exam.