sample size calculator

#1
We want to take a sample out of 500 (population) hospitals. We don't mind having an error of 5%. What is the methodology to calculate sample size? Especially, I don't understand that confidence interval of 5% or 10%. When we have already given confidence level in the calculation, why should one we confidence interval
 
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#2
uhhmm.........5% or 10% confidence interval is not valid since what is the point in selecting the sample if you're only 5% confident that it can really measure what you intend to measure......

it's 5% margin of error that you are saying.....

The other question as to what are the methodologies of getting a sample size the more common would be the Sloven's Formula just look it up in the internet ^^

and btw there are some sites that automatically solves your sample size problems though I forgot the name my bad..........