You can expect the ratios to change depending on the nature of the research you are conducting. For example, if you have a short questionnaire on a topic that is of great interest to your target population, you will probably need a smaller sample to get the number of completed interviews you need. Conversely, a long questionnaire on a topic that is not of great interest is likely to need a higher ratio of pieces of sample to completed interviews, as respondents may be more likely to refuse or end the interview midway through the questions.
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