I would like to ask you about the number of participants of the pilot study, is 40 persons are enough if the participants of the main survey are 385 persons?
It depends on the very nature of your study. But "40" is a good number for a pilot study anyway. Good luck.
Yes, a minimum sample size of 30 respondents is considered fine for a pilot study.
It does depend strongly on what exactly you want to find out. If the power of a test is of interest, there are formulas for that.
The relation between pilot study sample size and main study sample size is not important, unless those subjects come from the same, limited pool.
Dear Mr. Yusuf Arslan,
Thank so much for giving an answer. Good luck to you too
Dear Marija Topuzovska Latkovikj,
Thank you for confirming the size of the respondents of the pilot study. Thanks again
Dear Mr. Heiko Breitsohl,
First of all, Thanks for you. Your answer is really clear and very understandable. But, Could you explain what kind of formulas can use to calculate the size of sample for the pilot study if the goal of the test to reliable the survey items by Cronbach's alpha? @Heiko Breitsoh
The formulas I was referring to are relevant for power, not reliability.
Computing Alpha (or, more appropriately if your are using CFA, McDonald's Omega) will probably not be an issue with 40 subjects.
However, if your use CFA (which is probably appropriate and important), your model may not converge, and even if it does, you probably won't have enough power to detect any misfit between your model and the data.
Dear @Heiko Breitsohl
It is really clear now. Thank you for giving me the opportunity to have a very useful conversation with you. .After a chat with you, I feel more confident and capable, and for that I will always be grateful.
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