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Data Recording, Analysis and Presentation

Nominal, ordinal and interval data

  • 3 things to know
  • Component 01

Overview

Recall questions on nominal, ordinal and interval data with examples, why rating scales give ordinal data, which level carries most information, and which measure of central tendency suits each level.

What you need to know

Answer each one before you reveal it.

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Key term

Why is a rating scale score treated as ordinal rather than interval?

Key term

Which measure of central tendency is appropriate for nominal data, and why?

Key term

What is nominal data?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is nominal data?

    Model answer

    Data in the form of counts of how many items or people fall into separate, named categories.

  2. 2

    Give an example of nominal data collected in a psychological study.

    Model answer

    The number of participants choosing each of three possible answers to a question.

  3. 3

    What is ordinal data?

    Model answer

    Data that can be placed in rank order, but where the intervals between the points are not known to be equal.

  4. 4

    Give an example of ordinal data.

    Model answer

    Ratings of how anxious participants feel on a scale from 1 to 10.

  5. 5

    Why is a rating scale score treated as ordinal rather than interval?

    Model answer

    The difference between 1 and 2 on the scale is not necessarily the same size as the difference between 8 and 9.

  6. 6

    What is interval data?

    Model answer

    Data measured on a scale with equal, fixed units between the points.

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