WJEC A-Level Sociology 601-5237-0
Culture and the Social Construction of Culture
Socialisation and Its Agencies
Socialisation and Identity
Families and HouseholdsAcquiring Culture
Youth CulturesAcquiring Culture
Research Methods: Primary and Secondary
Sampling, Ethics and Practical Issues
Key Concepts and Theories of Research
EducationUnderstanding Society
MediaUnderstanding Society
ReligionUnderstanding Society
Crime and DeviancePower and Control
Health and DisabilityPower and Control
World SociologyPower and Control
Applied Methods: Designing Sociological Research
Social Inequality: Evidence and Patterns
Theories and Explanations of Inequality and Stratification
Sampling, Ethics and Practical Issues
Stratified random sampling
- 3 things to know
- AS Unit 2 and A2 Unit 4
Overview
Stratified random sample, stratum in sampling and why stratification is impossible without population data.
What you need to know
Answer each one before you reveal it.
If 20% of a school's pupils receive free school meals, how many of a stratified sample of 200 pupils should come from that group?
What information must the researcher have before stratifying a sample?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is a stratified random sample?
Model answer
A sample in which the population is divided into strata and a random sample is drawn from each in proportion to its size.
- 2
What is a stratum in sampling?
Model answer
A subgroup of the population sharing a characteristic relevant to the research, such as age band or sex.
- 3
Give the main advantage of stratified sampling over simple random sampling.
Model answer
It guarantees that each relevant subgroup appears in the sample in its correct proportion, so representativeness does not depend on chance.
- 4
If 20% of a school's pupils receive free school meals, how many of a stratified sample of 200 pupils should come from that group?
Model answer
Forty pupils, because 20% of 200 is 40.
- 5
What information must the researcher have before stratifying a sample?
Model answer
The proportions of each stratum in the target population.
- 6
Explain why stratification is impossible without population data.
Model answer
The correct proportions cannot be reproduced in the sample if the make-up of the population is unknown.
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