DA0-002 Data Analysis Practice Question
An analyst is preparing data for an A/B test and wants to ensure valid results. Which TWO of the following should be considered when calculating the required sample size?
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
✓
Desired effect size
Sample size calculation depends on desired effect size and statistical power, among other factors like significance level.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Data dimensionality
Why it's wrong here
Not relevant for sample size in A/B test.
- ✓
Desired effect size
Why this is correct
Correct: effect size is a key input.
- ✗
Skewness of data
Why it's wrong here
Skewness does not directly determine sample size.
- ✗
Number of features
Why it's wrong here
Not directly used for sample size in simple A/B test.
- ✓
Statistical power
Why this is correct
Correct: power (1 - β) is essential.
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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.