AQA A-Level Psychology 7182
Social Influence
Memory
Attachment
Approaches in Psychology
Biopsychology
Clinical Psychology and Mental Health
Research Methods
Scientific Processes
Quantitative and Qualitative Data
Data Handling and Analysis
Inferential Testing
Issues and Debates in Psychology
RelationshipsOption 1
GenderOption 1
Cognition and DevelopmentOption 1
SchizophreniaOption 2
Eating BehaviourOption 2
StressOption 2
AggressionOption 3
Forensic PsychologyOption 3
AddictionOption 3
Explanations for Nicotine AddictionOption 3
Data Handling and Analysis
Levels of measurement
- 4 things to know
- Paper 2
Overview
Nominal, ordinal and interval data, what distinguishes them, and why the level has to be identified before a test can be chosen.
What you need to know
Answer each one before you reveal it.
What is the ordinal level of measurement?
What is the interval level of measurement?
Why must the level of measurement be identified first?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is the nominal level of measurement?
Model answer
Data sorted into discrete categories that have no inherent order or ranking, such as gender or eye colour.
- 2
Give two examples of nominal data.
Model answer
Gender and eye colour.
- 3
What is the ordinal level of measurement?
Model answer
Data that can be placed in a meaningful order or rank, but where the intervals between ranks are not necessarily equal.
- 4
Provide two examples of ordinal data.
Model answer
Positions in a race and ratings on a Likert scale.
- 5
Why are the intervals between ordinal data points considered problematic for certain calculations?
Model answer
Because the intervals between ranks are not necessarily equal, so the difference between adjacent ranks may vary.
- 6
What is the interval level of measurement?
Model answer
Data with equal intervals between values on the scale, allowing for meaningful comparison of differences.
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