Often times Snap Projects Team, Snap Survey’s survey research team, is asked the question: How many responses do I need to collect from a random sample of respondents in order to receive accurate results?
You ask, we respond! When surveying a random sample of respondents, there are two key measures – Confidence Level and Margin of Error. Each of these key measures works together. For example, if you have a 95% confidence level and a 5% margin of error, and a question answered by 50% of your sample, then 19 out of 20 times, the true answer – the answer you would find if every single person in the target population answered this question – can be assumed to be in the range of 45% to 55%.
The following table explains the number of survey responses you need, depending on the number of people in your target population.
Survey Responses needed for: 95% Confidence level with +/- 5% Margin of Error
|Population Size||Responses Needed|
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