Psychology A-Level
stratified sampling
What stratified sampling means in Psychology A-Level, as defined for OCR.
Definition of stratified sampling
Check what you remember
Read the wording for your board, then hide it and explain stratified sampling in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
The subgroups that matter are identified, the proportion each holds in the population is worked out, and selection is random inside each stratum so those proportions are reproduced.
Topics that use stratified sampling
- D.1 – handling data (OCR A-Level)
Related terms
- bar charts and histograms
- calculating tests of difference
- central tendency on a curve
- checking data quality
- co-variables
- comparing two conditions
- content analysis
- correlation coefficients
Using stratified sampling in the exam
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