Finding Sample Size for a Confidence Interval for Proportions

An example of how to find a minimum sample size for a C.I. for proportions.

[@surferrosa7285]

You are a wonderful beautiful man. Just spent 3 hours trying to work out a question until I came across your vid and got the answer in 2 mins using your method. Thanks so much for your vid

[@biancabacigalupo5453]

This was so helpful! thank you :)))

[@boris3194]

savior.

[@zinaEfflorescence]

I'm trying to find a sample size of a population. If you know the percentage from, let's say a pretest and it is 50%, what would q be?