Eduqas A-Level Sociology A200QS
Culture and the Social Construction of Culture
Socialisation and Its Agencies
Socialisation and Identity
Option: Families and HouseholdsFamilies
Option: Youth CulturesYouth cultures
Option: EducationEducation
Option: MediaMedia
Option: ReligionReligion
Research Methods: Primary and Secondary
Sampling, Ethics and Practical Issues
Key Concepts and Theories of Research
Social Inequality: Evidence and Patterns
Theories and Explanations of Inequality and Stratification
Option: Crime and DevianceCrime
Option: Health and DisabilityHealth
Option: PoliticsPolitics
Option: World SociologyWorld sociology
Sampling, Ethics and Practical Issues
Stratified random and quota sampling
- 3 things to know
- Component 2
Overview
Stratified random sample, disproportionate stratification and quota sample.
What you need to know
Answer each one before you reveal it.
What is a stratified random sample?
How are the sizes of the strata decided in a stratified random sample?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is a stratified random sample?
Model answer
A stratified random sample divides the population into strata such as age, sex or class. A random sample is then drawn from within each stratum.
- 2
How are the sizes of the strata decided?
Model answer
Each stratum is normally sampled in proportion to its share of the population. A group forming a fifth of the population supplies a fifth of the sample.
- 3
Why is a stratified sample usually more representative than a simple random one?
Model answer
Stratification guarantees that each group appears in its correct proportion. Chance cannot leave a group out.
- 4
What must a researcher already know in order to stratify a sample?
Model answer
The researcher must know the proportions of each relevant characteristic in the population. Census figures usually supply them.
- 5
What is disproportionate stratification, and why use it?
Model answer
Disproportionate stratification deliberately over-samples a small group so that enough of its members are studied. A minority forming two per cent of the population would otherwise yield too few cases to analyse.
- 6
Give two costs of stratified sampling.
Model answer
Stratified sampling needs accurate population data and a frame carrying the stratifying characteristics. A separate draw within every stratum also takes longer.
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