Sampling distributions with proportions are very similar sampling distributions with means. We are still going to use the z-score formula, but we're going to use it with proportions parameters. They are:
p-hat, the sample proportion (instead of x-bar)
p, the population proportion (instead of mu)
std. dev. of p, which is found by taking the square root of p(1-p)/n
and n, the number of observations.
Use the same z-score formula (sample-population/std. dev) to solve.
I realize that this explanation is kind of vague, so please check the link below for a video example of how to solve this type of problem:
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