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sampling strategies (used for theses reason (time, equipment, money,…
sampling strategies
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random
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disadvantages
lead to poor representations of overall parent population or f large areas are not hit by random numbers generated. could make study area very large.
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systematic
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disavantages
more biased, as not all members have an equal chance
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stratified
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advantages
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if the proportions of the subsets are know, it generates results which are more representative of whole population
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