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 |
| 10 | 10 |
| 100 | 80 |
| 200 | 132 |
| 300 | 169 |
| 400 | 197 |
| 500 | 218 |
| 600 | 235 |
| 700 | 249 |
| 800 | 260 |
| 900 | 270 |
| 1,000 | 278 |
| 2,000 | 323 |
| 5,000 | 357 |
| 10,000 | 370 |
| 20,000 | 377 |
| 100,000 | 383 |
| 1,000,000 | 385 |
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