WJEC A-Level Psychology 601-5719-7
Psychology Past to Present — The Five Approaches
Contemporary Debates
Principles of Research and Application of Research Methods
Mathematical Requirements for Psychology (Appendix A: AS Unit 2 and A2 Unit 4)
Addictive BehavioursAddictive
Autistic Spectrum BehavioursAutistic spectrum
Bullying BehavioursBullying
Criminal BehavioursCriminal
SchizophreniaSchizophrenia
StressStress
Controversies in Psychology
Applied Research Methods
Applied Research Methods
Additional Methodologies (Unit 4): longitudinal studies and cross-sectional studies
- 3 things to know
- A2 Unit 4
Overview
Longitudinal and cross-sectional designs applied to questions such as vocabulary growth, attrition and the cohort effect, practical and ethical issues, and which design controls for participant variables.
What you need to know
Answer each one before you reveal it.
How would the same vocabulary question be tackled cross-sectionally?
State the main advantage a longitudinal design has over a cross-sectional one.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is a longitudinal study?
Model answer
It is a study in which the same participants are followed and measured repeatedly over an extended period, often years, to see how they change.
- 2
What is a cross-sectional study?
Model answer
It is a study in which different groups, usually of different ages, are compared with one another at a single point in time.
- 3
A researcher wants to know how vocabulary develops between the ages of 4 and 11. Describe how this could be investigated longitudinally.
Model answer
A single group of four-year-olds would be recruited and their vocabulary measured at intervals as they grew up, with the same children retested each time until they reached eleven.
- 4
How would the same vocabulary question be tackled cross-sectionally?
Model answer
Separate groups of four-, seven- and eleven-year-olds would be given the same vocabulary measure at the same time and their scores compared.
- 5
State the main advantage a longitudinal design has over a cross-sectional one.
Model answer
Each participant serves as their own baseline, so any change found cannot be explained away by individual differences between the people making up each group.
- 6
What is attrition, and why does it threaten a longitudinal study?
Model answer
Attrition is the loss of participants during the course of the study, and it is a threat because those who remain may differ systematically from those who leave, so the sample left at the end is biased.
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