DA0-002 Data Acquisition and Preparation Practice Question
A data analyst needs to perform stratified sampling on a customer database to ensure proportional representation across three regions: North (40%), South (30%), and West (30%). The total sample size required is 1,000. How many customers should be sampled from the North region?
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
✓
400
Stratified sampling with proportional allocation: sample size per stratum = (stratum proportion) * total sample size. North = 0.40 * 1000 = 400.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
333
Why it's wrong here
Incorrect calculation.
- ✗
500
Why it's wrong here
That would be 50%.
- ✗
300
Why it's wrong here
That would be 30% of 1000, which corresponds to South or West.
- ✓
400
Why this is correct
Correct: 40% of 1000.
Go deeper
Related to this question
About these practice questions
This DA0-002 question is part of Courseiva's 986-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.