RESEARCH METHODS: SAMPLING

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SAMPLING UNIT
level at which sampling takes place e.g. if studies people in hospitals, the unit would be hospital not individs
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SAMPLING FRAME
list of people from which a sample will be taken e.g. the electoral register
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SURVEY POPULATION
self explain
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REPRESENTATIVENESS
who far a study is reflective of other dimilar kinds of groups
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RANDOM
unbiased selection method whereby each member of the population has an equal chance of being picked
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EVAL:
extremely objective technique - only representative if sampling frame is representative
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SYSTEMATIC RANDOM
sampling is random but the samples are draen systematically from a list
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EVAL:
limited as list is normally in alphabetical order -- generally seen as more representative as sample is more evenly spread
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STRATIFIED RANDOM
pop divided into select groups, then sample taken from each group that is proportionate to the number of members in that group
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EVAL:
very rep as population as a whole = reliable // BCS is an example of this method, aims to integrate a wide cross-section of society
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QUOTA
sim to strat ran ecept the need to obtain the correct number of each 'sort of person' requred in each category from the outset
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EVAL:
rep and valid as researcher is certain right people investigated = findings relevant
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SNOWBALL
contcting key individs who suggest others to be interviewed
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EVAL:
no rep but helps to get those who may of been difficult to get
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VOLUNTEER
advertises the study , looking for volunteers
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EVAL:
ethical; but aren't rep as volunteers are like-minded
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Card 2

Front

SAMPLING FRAME

Back

list of people from which a sample will be taken e.g. the electoral register

Card 3

Front

SURVEY POPULATION

Back

Preview of the front of card 3

Card 4

Front

REPRESENTATIVENESS

Back

Preview of the front of card 4

Card 5

Front

RANDOM

Back

Preview of the front of card 5
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