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Data Handling, Statistics and Mathematical Skills

Levels of measurement

  • 3 things to know
  • Component 2

Overview

Recall questions on Levels of measurement.

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Key term

Define nominal data.

Key term

An observer records how many children are playing alone, in a pair, or in a group. What level of measurement is this?

Key term

Define ordinal data.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What does a data set's level of measurement tell you?

    Model answer

    It tells you what kind of information the numbers actually carry, which in turn decides which descriptive statistics and which inferential test may legitimately be used.

  2. 2

    Define nominal data.

    Model answer

    Nominal data are frequency counts of items placed into named, separate categories that have no order and no numerical value.

  3. 3

    An observer records how many children are playing alone, in a pair, or in a group. What level of measurement is this?

    Model answer

    Nominal, because the data are counts of how many cases fall into each named category.

  4. 4

    Define ordinal data.

    Model answer

    Ordinal data are scores that can be placed in rank order, but where the gaps between adjacent positions are not guaranteed to be equal.

  5. 5

    Why is a self-rating of anxiety on a scale of 1 to 10 treated as ordinal rather than interval?

    Model answer

    Because the difference between 4 and 5 is not necessarily the same size as the difference between 8 and 9, so the intervals are not equal.

  6. 6

    Define interval data.

    Model answer

    Interval data are measured on a scale with equal, fixed intervals between adjacent points, but with no true zero.

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