[citation][nom]Silmarunya[/nom]Rule 1 in the statistics handbook: the number of participants is irrelevant if the subjects are chosen randomly and represent all relevant groups. If this was the case, even 92 could be enough to give a relevant picture (although with a higher margin of error than a larger group would have provided).[/citation]
Uhh... a larger sample size would make the study more valid. What you are suggesting is, if every subject represented all relevant groups and chosen randomly, a study with 30 participants would be just as valid as a study with 1000 instead? The reason why larger sample sizes make the study more valid is b/c a larger sample size can eliminate or diminish any bias or unknown variables. The whole point of statistical studies is to lower the margin of error into acceptable ranges so any changes in the results of your studies is from variables that you have control over (so you know they are indeed variables that is affecting the study and not just some unknown variables or extreme outliers). Therefore, you need a larger sample size to conclusively suggest anything....