DA0-002 Data Acquisition and Preparation Practice Question
In a dataset of employee salaries, the analyst notices one value that is significantly higher than the rest. Using the IQR method, which values are typically considered outliers?
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
✓
Values beyond Q1 - 1.5*IQR or Q3 + 1.5*IQR
Outliers are values less than Q1 - 1.5*IQR or greater than Q3 + 1.5*IQR.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Values beyond Q1 - 3*IQR or Q3 + 3*IQR
Why it's wrong here
Too extreme.
- ✓
Values beyond Q1 - 1.5*IQR or Q3 + 1.5*IQR
Why this is correct
Standard IQR outlier definition.
- ✗
Values beyond mean ± 2 standard deviations
Why it's wrong here
That's Z-score method.
- ✗
Values beyond min and max
Why it's wrong here
All data is between min and max.
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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.