Which of the following best describes nominal data?

Question

BlackTom AI · Accepted Answer

Nominal data are categories or labels that identify distinct groups without any natural ranking or order, so option b is correct.

1. Relevant knowledge points and concepts
- Levels of measurement: nominal, ordinal, interval, ratio. Nominal = names/labels; ordinal = ordered categories without equal intervals; interval = numerical scale with equal intervals (no true zero); ratio = numerical with equal intervals and true zero. Quantitative data (counts/measurements) are numeric and can be discrete or continuous.

2. Step-by-step reasoning
- Identify the phrasing of each option and match to level-of-measure definitions.
- Option b describes categories and explicitly states “no inherent order,” which matches the definition of nominal.
- Check the other options to ensure no better match exists.

3. (Calculations) No numeric calculations are required for this conceptual question.

4. Why the correct answer is correct
- Nominal variables group observations into mutually exclusive categories (e.g., blood type, hair color, city names). You can count frequencies and compute modes, but you cannot meaningfully order categories or compute differences. Option b captures these features precisely.

5. Why the other options are incorrect
- Option a: “meaningful order but no fixed intervals” describes ordinal data (e.g., rankings: small/medium/large, Likert scales), not nominal.
- Option c: “numerical scale with equal intervals” describes interval data (e.g., temperature in Celsius), which are numeric and have equal spacing—unlike nominal labels.
- Option d: “data representing counts or measurements” describes quantitative data (discrete counts or continuous measurements), not nominal categorical labels.

6. Conclusion
- Matching definitions and eliminating alternatives shows option b (“Data categorised into distinct groups with no inherent order”) is the correct choice, confirming the provided answer.

Which of the following best describes nominal data?Single choice

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