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A booster sample is an extra set of interviews focusing on a particular segment of the population (age group, gender, user of a certain brand, ect). Booster is an over-representation of a certain type of respondents, which is most of the time the case with simple random sampling - and very low in terms of numbers to be used as a base for reliable statistical analysis.
Also see: Research Sample, Representative Sample (random), Simple sample selection.
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