Sampling
- Created by: Elyseee
- Created on: 06-05-20 10:16
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- Sampling
- random sampling
- lottery method/random number generator - everyone has an equal chance of getting picked
- advantage: unbiased, everyone in target population has equal chance of getting picked
- disadvantage: need list of all members of target population, need to contact those selected, takes more time
- stratified and quota
- subgroups within target population are identified, participants selected from each group in proportion to appearance in target population
- quota - not random
- stratified - random
- advantages: more representative proportional representation of population
- disadvantage: time consuming
- subgroups within target population are identified, participants selected from each group in proportion to appearance in target population
- opportunity sampling
- recruiting people who are most convenient and available eg) students in your class
- advantage: easy, takes less time
- disadvantage: biased, not representative, only includes small amount of target population
- systematic sampling
- predetermined system to select participants eg) every 5th person
- advantage: unbiased, objective system used
- disadvantage: nit truly unbiased - would have to use random number method, start with that person and then select every nth person
- snowball sample
- participants recruit other participants from people they know. group grows like a snowball
- advantages: locate groups that are difficult to access eg) drug dealers
- disadvantage: not representative, not a good cross section of population, made up of family and friends
- self selected
- advertised in newspaper/ noticeboard/ internet
- advantages: access to variety of participants, less biased, more representative
- disadvantage: volunteer bias - participants motivated to be helpful
- random sampling
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