AQA A-Level Psychology 7182
Social Influence
Memory
Attachment
Approaches in Psychology
Biopsychology
Clinical Psychology and Mental Health
Research Methods
Scientific Processes
Quantitative and Qualitative Data
Data Handling and Analysis
Inferential Testing
Issues and Debates in Psychology
RelationshipsOption 1
GenderOption 1
Cognition and DevelopmentOption 1
SchizophreniaOption 2
Eating BehaviourOption 2
StressOption 2
AggressionOption 3
Forensic PsychologyOption 3
AddictionOption 3
Explanations for Nicotine AddictionOption 3
Quantitative and Qualitative Data
Descriptive statistics: measures of central tendency and measures of dispersion
- 4 things to know
- Paper 2
Overview
The mean, median and mode and when each suits the data, and the range and standard deviation as measures of spread.
What you need to know
Answer each one before you reveal it.
Define the median.
What is the mode, and which data suits it?
Why is standard deviation more representative than the range?
Questions from this subtopic
Each one with the model answer underneath.
- 1
After summing all values in a data set, what must you do to complete the calculation of the mean?
Model answer
Divide the sum by the number of values (n).
- 2
State the formula for calculating the mean.
Model answer
x̄ = Σx / n (sum of all values divided by the number of values).
- 3
Calculate the mean when value 1 = 36, value 2 = 21, value 3 = 46, value 4 = 40, value 5 = 11.
Model answer
Mean = (36 + 21 + 46 + 40 + 11) ÷ 5 = 30.8.
- 4
Define the median.
Model answer
The median is the middle value when all scores are arranged in order.
- 5
When finding the median with an odd number of values, what must you do first?
Model answer
Arrange the values in ascending or descending order.
- 6
Once values are arranged in order for an odd-numbered data set, how do you identify the median?
Model answer
Select the value in the central position.
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