Eduqas A-Level Psychology A290QS
Biological Approach
Psychodynamic Approach
Behaviourist Approach
Cognitive Approach
Positive Approach
Comparing the Five Approaches
Core Studies in Social and Developmental Psychology
Planning Psychological Research
Data Handling, Statistics and Mathematical Skills
Evaluating and Validating Research
Personal Investigations and Novel Research Scenarios
Addictive BehavioursAddictive
Autistic Spectrum BehavioursAutistic spectrum
Bullying BehavioursBullying
Criminal BehavioursCriminal
SchizophreniaSchizophrenia
StressStress
Controversies in Psychology
Data Handling, Statistics and Mathematical Skills
Inferential statistics: Mann Whitney U test and Critical values from tables
- 3 things to know
- Component 2
Overview
Recall questions on Mann Whitney U test and Critical values from tables.
What you need to know
Answer each one before you reveal it.
A study compares recall scores between two separate groups of participants using ranked data. Name the test and justify the choice.
A study records for each participant whether their mood improved after an intervention compared with before it. Name the test and justify the choice.
Questions from this subtopic
Each one with the model answer underneath.
- 1
When is the Mann Whitney U test the correct choice?
Model answer
When testing for a difference between two conditions using an independent groups design with data that are at least ordinal.
- 2
When is the Wilcoxon matched pairs signed ranks test the correct choice?
Model answer
When testing for a difference between two conditions using a repeated measures or matched pairs design with data that are at least ordinal.
- 3
When is the Sign test the correct choice?
Model answer
When testing for a difference using a repeated measures or matched pairs design where the data are nominal, such as whether each participant improved or did not.
- 4
When is Spearman's rank order correlation coefficient the correct choice, and what values can it take?
Model answer
It is used when testing for a relationship between two co-variables that are at least ordinal, and it can take any value from −1 to +1.
- 5
What three questions decide which inferential test to use?
Model answer
Is the study looking for a difference or a relationship, is the design related or unrelated, and what is the level of measurement of the data.
- 6
A study compares recall scores between two separate groups of participants using ranked data. Name the test and justify the choice.
Model answer
Mann Whitney U should be used, because the study tests for a difference, the design is independent groups, and the data are ordinal.
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