DA0-002 Data Concepts and Environments Practice Question
A data analyst at a healthcare clinic is organizing patient records. The analyst needs to categorize each patient's blood pressure reading as 'Low', 'Normal', 'Elevated', or 'High' based on clinical thresholds. The categories have a clear order from lowest to highest risk. Which measurement scale best describes this classification?
⚠ Common exam trap
The trap here is assuming that any set of categories is nominal, overlooking the meaningful order that elevates this classification to ordinal.
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
✓
Ordinal
The blood pressure categories have a clear rank order from lowest to highest risk but lack equal intervals or a true zero, which is the defining characteristic of ordinal data. Nominal data would ignore the ranking, while interval and ratio scales require numeric properties that these qualitative labels do not possess.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Interval
Why it's wrong here
Interval data has ordered categories with equal, meaningful differences between values, such as temperature in Celsius. The blood pressure categories here do not have equal spacing between them, and no true zero exists. Treating them as interval data would incorrectly imply that the gap between 'Low' and 'Normal' equals the gap between 'Elevated' and 'High'.
- ✗
Nominal
Why it's wrong here
Nominal data consists of categories with no inherent order or ranking, such as blood type or eye color. Here, the blood pressure categories follow a meaningful sequence from low to high risk, so treating them as unordered labels would discard clinically important information and prevent valid comparisons like determining whether a patient improved.
- ✓
Ordinal
Why this is correct
Ordinal data has categories with a meaningful order but unequal or undefined intervals between them. The blood pressure classifications progress from low to high risk in a defined sequence, yet the difference between 'Normal' and 'Elevated' is not a fixed numeric quantity. This ordered categorization fits the ordinal scale precisely.
- ✗
Ratio
Why it's wrong here
Ratio data possesses all the properties of interval data plus a true zero point, allowing meaningful ratios. The blood pressure categories are qualitative labels without numeric values or a true zero, so ratio operations like 'twice as high' are nonsensical. This scale is reserved for continuous numeric measurements such as weight or age.
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Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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.