Minimum sample size for online survey?

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Discussion thread: Poverty, Social Disadvantage, and Social Protection

Allan

14 October 2019

Minimum sample size for online survey?

We are about to do a survey on one of our online ads and its effect on youth's perspective. What would be the minimum sample size for a survey conducted online? Will it be different from the survey off-line? The demographics are male / female, aged 15 to 24 years. Thank you.

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Jason Jiang

21 February 2020

It depends on your research question. Generally, the larger the sample size, the better.

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Allan

3 December 2019

Thank you so much Dr. MEL!!

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Dr. MEL

29 October 2019

There is no fixed rule, just because of the impossible of random sampling in most settings. Anyhow, if it is a random sampling, 1,537 cases will be necessary to obtain a 95% confidence interval that is 10% of the standard deviation. This is the minimum as random sampling is hardly achievable.

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