What is the number of participants needed in a study to generalize findings?

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Avishag Gordon

Hi,

I guess that by the word "participants" you mean "sample size". So, it depends on the research question, if it considers the population of a whole country, or one town or one university. In each case the sample size for generalizing the results, is different.

Peter Samuels

Dear Sean,

Sample size calculations depend upon the statistical design, the size of the effect you are seeking to find and the level of confidence at which you wish to detect it. The best tool is called G* Power. It is freely available and has a manual which explains things in more detail.