DA0-002 Data Acquisition and Preparation Practice Question
An e-commerce company wants to analyze sales performance across product categories. The dataset includes transaction amounts and a column 'category' with values (Electronics, Clothing, Home). The analyst decides to use stratified sampling to ensure proportional representation. Which THREE steps are required to implement this? (Select THREE).
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
✓
Calculate the proportion of each category in the population
Stratified sampling requires dividing the population into strata (categories), then randomly sampling from each stratum in proportion to its size. Combining strata or simple random sampling without stratification would not achieve proportional representation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Calculate the proportion of each category in the population
Why this is correct
Proportions are needed to determine sample sizes per stratum.
- ✓
Take a random sample from each stratum with size proportional to its population proportion
Why this is correct
This ensures proportional representation.
- ✓
Divide the dataset into three strata based on category
Why this is correct
Strata are defined by the category column.
- ✗
Select every 10th transaction from the entire dataset
Why it's wrong here
This describes systematic sampling, not stratified.
- ✗
Combine all categories into a single group and perform simple random sampling
Why it's wrong here
This is simple random sampling, not stratified.
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Written by Johnson Ajibi, MSc IT Security
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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.