How to decide which project needs 5 users & which needs 50?

I really liked the post, I think it gives very good information but there is something missing very important. What’s the reason of those ranges? 5–10 /10–20 / 15–30. What is the statistical reason?

I understand you took those ranges based on Creswell book, I haven’t read that book and I think it is a very important piece of information to complete this post and answer the question in the title.


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