Stratified Sample
- Created by: 0045253
- Created on: 01-06-22 14:33
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- Sampling Method: Stratified
- Sub-groups of ppts (strata) are selected in proportion to their frequency in the population in order to obtain a representative sample.
- 1. Identify how many people make up the whole population.
- 2. Identify the proportion of people which make up the different
sub-group (strata). This can be
expressed as a percentage.
- 3. Calculate the number of people required from each strata.
- 4. The sample
must then contain all these groups in the same proportion as in the target
population.
- 5. Randomly select the required number from the whole strata.
- 4. The sample
must then contain all these groups in the same proportion as in the target
population.
- 3. Calculate the number of people required from each strata.
- 2. Identify the proportion of people which make up the different
sub-group (strata). This can be
expressed as a percentage.
- STRENGTH
- Produces a more representative sample as it designed to reflect the population.
- WEAKNESS
- The identified strata (subgroup) cannot reflect all the ways ppts are different so is not fully representative.
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