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The closeness with which the data being gathered feeds into the aims of the study.
Research population, or its derivatives such as survey population and experimental population, is the total number of potential subjects for your research. If this population is larger than you need or can cope with, then you should use a rational and unbiased process for reducing the number (sampling).
The proportion of people asked to take part in research who actually become respondents. Non-response occurs when you have selected a sample and some of them do not provide data, which can occur for all sorts of reasons, but most often through your inability to make contact or their refusal. Usually face-to-face surveys will have a non-response rate of around 25%, and postal surveys closer to 50%.
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