DA0-002 Data Concepts and Environments Practice Question
A data analyst is examining a dataset of customer transactions. The analyst notices that the 'TransactionAmount' column contains values like 100.50, 200.75, and 50.00. The analyst wants to determine the average transaction amount. Which type of data is 'TransactionAmount'?
⚠ Common exam trap
Test-takers frequently confuse interval and ratio data by overlooking the presence of a true zero in monetary values.
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
✓
Ratio
TransactionAmount is ratio data because it has a true zero point and equal intervals between values. This allows for meaningful arithmetic operations such as calculating an average. Nominal data is categorical, ordinal data has unequal intervals, and interval data lacks a true zero, so none of those fit.
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 values with equal intervals but no true zero, like temperature in Celsius. TransactionAmount has a true zero (a transaction of $0 means no money exchanged), so it is not interval. The presence of a meaningful zero distinguishes ratio from interval.
- ✓
Ratio
Why this is correct
Ratio data has all the properties of interval data plus a true zero, allowing for meaningful ratios and arithmetic operations. TransactionAmount has a true zero (no transaction) and equal intervals, so it is ratio data. Averages, sums, and ratios are valid for ratio data.
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Nominal
Why it's wrong here
Nominal data consists of categories without any order or numeric meaning, such as colors or gender. TransactionAmount is a numeric value that supports arithmetic operations like averaging. Nominal data cannot be averaged meaningfully, so this is incorrect.
- ✗
Ordinal
Why it's wrong here
Ordinal data has a clear order but the intervals between values are not necessarily equal, such as customer satisfaction ratings. TransactionAmount has equal intervals (e.g., the difference between $100 and $200 is the same as between $200 and $300) and a true zero, so it is not ordinal.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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