Quote:
Originally Posted by nekokami
There's a big difference (more than an order of magnitude) between 24 and 350. And I prefer the 5% error margin, so one would need at least 500 participants to design a study, even using these guidelines.
The other problem with these guidelines is that they don't take the complexity of the sample into account.
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Yes, of course. But depending on what you are studying and the result a smaller sample size can give statistical significant result. I read the comments about sample size in this thread as a disbelief that a small sample size ever could be statistical significant. And since that is a common error to believe that I just wanted to point that out.