Hi Sbgha, The minimum sample size for coefficient alpha is commonly suggested as 200, 300, or 500. I'm attaching a relevant article.

Good luck, Rachel.

Hi Sibgha,

This link may be useful for you:

https://books.google.com/books?id=d7b4DAAAQBAJ&pg=PA116&dq=minimum+sample+size+cronbach&hl=en&sa=X&ved=0ahUKEwjp9IupyIfdAhUCP6wKHWX7B-IQuwUIOTAC#v=onepage&q=minimum%20sample%20size%20cronbach&f=false

Have a great day!

--Adrian

How many minimum sample size required to check the reliability of questionnaire in social sciences in pilot testing by Cronbach Alpha ?

For pilot study only, it should be around 30 - between 30-50 will be good if you can get such sample size. For actual data collection, you should get around 200-400 samples.

For pilot study, 20-40 sample is appropriate. You select around 10% of the intended actual sample size:

200-20

300-30

400-40

this link is useful

www.open.ac.uk/socialsciences/spsstutorial/files/.../cronbachs-alpha.p...

regards