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
Mathematical Requirements for Psychology (Appendix A: AS Unit 2 and A2 Unit 4)
Graphs: plotting and labelling a graph, gradients and intercepts
- 3 things to know
- AS Unit 2 and A2 Unit 4
Overview
Recall questions on plotting a graph, labelling a graph, gradients and intercepts.
What you need to know
Answer each one before you reveal it.
Which display is used for two continuous variables measured on the same participants in a correlational investigation?
On a scatter diagram, which variable belongs on which axis?
Questions from this subtopic
Each one with the model answer underneath.
- 1
A researcher has the mean score for each of three experimental conditions. Which form of display is appropriate, and why?
Model answer
A bar chart is appropriate, because the conditions are separate discrete categories, so the bars are drawn the same width and separated by gaps.
- 2
Which display is used for two continuous variables measured on the same participants in a correlational investigation?
Model answer
A scatter diagram is used, with one point marking each participant's pair of scores.
- 3
On a scatter diagram, which variable belongs on which axis?
Model answer
Either variable may go on either axis, because a correlation has two co-variables rather than an independent and a dependent variable.
- 4
On a bar chart summarising an experiment, what is shown on each axis?
Model answer
The conditions of the independent variable are shown along the horizontal axis and the measured values of the dependent variable up the vertical axis.
- 5
A vertical axis is marked with gridlines every 5 units. A bar reaches exactly midway between the lines labelled 20 and 25. What value does it show?
Model answer
The bar shows a value of 22.5.
- 6
A line of best fit passes through the points (2 h, 8.5 h) and (6 h, 6.5 h) on a graph of screen time against sleep. What is the gradient, and what does it mean?
Model answer
The gradient is (6.5 − 8.5) ÷ (6 − 2) = −0.5, meaning sleep falls by about half an hour for every extra hour of screen time, a negative relationship.
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