DA0-002 Data Analysis Practice Question
An analyst is conducting an A/B test on a new website layout. Which TWO of the following must be defined before the test begins?
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
✓
The significance threshold (alpha)
Sample size and significance level must be set a priori to ensure proper test design.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The final conversion rates for each group
Why it's wrong here
Observed after test.
- ✗
The actual p-value from the test
Why it's wrong here
p-value is calculated after the test.
- ✗
The confidence interval for the lift
Why it's wrong here
Calculated after test.
- ✓
The significance threshold (alpha)
Why this is correct
Must be set beforehand.
- ✓
The sample size required for adequate statistical power
Why this is correct
Should be determined before test.
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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.