sampling techniques
- Created by: brennadoyle
- Created on: 30-10-20 17:52
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- sampling techniques
- random sampling
- everyone has an equal chance of being picked
- strengths
- convient - researchers need committed ppt- less likely to drop out
- good way to get specialised group of people- purposivesampling
- convient - researchers need committed ppt- less likely to drop out
- weaknesses
- likely to be biased- as volunteers motivated/ more willing than general public
- can't generalise
- volunteer also more helpful = prone to guessing aims
- likely too respond to demand characteristics
- likely to be biased- as volunteers motivated/ more willing than general public
- opportunity sampling
- whoever is willing and available
- strengths
- most convient-little prep
- takes the least amt of time
- may be only technique available
- most convient-little prep
- weaknesses
- inevitablybiased- sample is from small group
- not represntative - can't generalise
- ppt may refuse to take part- final sample has same as volunteer sample
- open to demand characeteristics
- inevitablybiased- sample is from small group
- random sampling
- every member of target population has equal chance of being selected
- strengths
- unbiased + all members have equal chance
- possible to choose specific subgrouptaget pop- makes easy to select
- unbiased + all members have equal chance
- weaknesses
- biased sample if not all selected want to take part
- take time- need to obtain all names then choose then contact
- not often random- not all want to take part- ends up like volunteer/opp sample
- take time- need to obtain all names then choose then contact
- biased sample if not all selected want to take part
- stratified sampling
- ppt selected from diff subgroups (strata) which are proportional to target pop
- strengths
- most representative - all in proportion
- specific subgroups - chosen according to variables
- increases-control over possible extraneous variable
- specific subgroups - chosen according to variables
- weaknesses
- subgroup might be biased- not representative
- lengthy process- ppt may not agree to participate
- subgroup might be biased- not representative
- most representative - all in proportion
- random sampling
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