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
Fractions, percentages and estimating results
- 3 things to know
- Component 01
Overview
Recall questions on fractions and percentages of samples, pie chart angles, why percentages help compare groups, small-sample percentages, estimating ranges and means, impossible percentages, and converting between fractions, decimals and percentages.
What you need to know
Answer each one before you reveal it.
What is the main danger of reporting a percentage from a very small sample?
A set of scores runs from a lowest value of 12 to a highest value of 47. Estimate the range.
Questions from this subtopic
Each one with the model answer underneath.
- 1
In a study of 24 participants, 18 obeyed. Give this as a fraction in its simplest form and as a percentage.
Model answer
It is three quarters of the sample, which is 75%.
- 2
An observation sorts behaviours into three categories, with 40% in the first and 35% in the second. What percentage falls in the third?
Model answer
It is 25%, because the three categories must account for 100% of the behaviours.
- 3
How do you convert a percentage of a sample into an angle for a pie chart?
Model answer
Multiply the percentage as a decimal by 360, so 15% becomes 54°.
- 4
Why are percentages more useful than raw frequencies when comparing two groups of different sizes?
Model answer
They put both groups on the same scale of 100, so the proportions can be compared directly.
- 5
What is the main danger of reporting a percentage from a very small sample?
Model answer
A single participant changes the percentage by a large amount, so the figure looks more precise and more stable than the data really is.
- 6
What does it mean to estimate a result?
Model answer
To work out an approximate value using rounded figures, as a quick check on the size of the answer rather than an exact calculation.
Other ways to work this
The same content, four other ways.
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