OCR A-Level Psychology H567
Research Methods and Techniques
Planning and Conducting Research
Data Recording, Analysis and Presentation
Report Writing and Scientific Communication
Practical Activities and the Nature of Science
Mathematical Requirements for Research Methods
Studying and Evaluating the Core Studies: The Common Framework
Core Studies: Social Area
Core Studies: Cognitive Area
Core Studies: Developmental Area
Core Studies: Biological Area
Core Studies: Individual Differences Area
Areas and Perspectives in Psychology
Debates in Psychology
Practical Applications of Psychology
Issues in Mental Health
Child PsychologyApplied option
Criminal PsychologyApplied option
Environmental PsychologyApplied option
Sport and Exercise PsychologyApplied option
Methodological Issues and Debates Running Through Applied Psychology
Mathematical Requirements for Research Methods
Correlation coefficients, pie charts and translating between data forms
- 3 things to know
- Component 01
Overview
Recall questions on interpreting scatter diagrams and correlation coefficients, translating between graphical, numerical and algebraic forms, calculating pie chart sectors, and choosing pie charts, line graphs and other displays.
What you need to know
Answer each one before you reveal it.
When is a pie chart a suitable display?
What does the closeness of the points to a straight line indicate?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What does the closeness of the points to a straight line indicate?
Model answer
The strength of the correlation, with tightly clustered points showing a strong relationship and widely scattered points a weak one.
- 2
A correlation coefficient of −0.78 is calculated. Describe the relationship.
Model answer
It is a strong negative correlation, so as scores on one co-variable rise, scores on the other tend to fall.
- 3
What is the possible range of values for a correlation coefficient?
Model answer
From −1 through 0 to +1.
- 4
Why is a scatter diagram not the right display for an experiment comparing two conditions?
Model answer
An experiment tests a difference between conditions, which is shown by a bar chart of the condition means. A scatter diagram displays the strength and direction of a relationship between two measured variables, which is a correlational question.
- 5
What is meant by translating information between graphical, numerical and algebraic forms?
Model answer
Moving between a set of raw scores, a summary such as a mean or a coefficient, a visual display and a symbolic expression such as a formula or an equation, while keeping the same information intact.
- 6
In a study of 180 participants, 45 chose the first option. What angle would this sector occupy on a pie chart?
Model answer
It is 25% of the sample, so the sector is 90°.
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