Hi, I made survey in which respondents could choose between 20 different categories. To answer my research question I will just be using descriptive statistics and no inferential tests. I want to calculate the sample size I need, and need Cochran's formula for that (right?), n = (t^2)*(pq)/(0.05)^2, where q=p-1?

Could someone help me with figuring out what to fill in for p q in this case? Thank you very much in advance!

Could someone help me with figuring out what to fill in for p q in this case? Thank you very much in advance!

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