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Strathclyde
strathspey
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stratification
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stratified sample
strat·i·fied sam·ple (plural strat·i·fied sam·ples)


noun 
Definition:
 
proportional sample from whole population: a sample of a population that is proportionally representative of all types of people of interest in the survey
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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