mean and standard error

Question

Suppose the true proportion of voters in the county who support a specific candidate is 0.58. Consider the sampling distribution for the proportion of supporters with sample size n = 135.

What is the mean of this distribution?

What is the standard error of this distribution?

Answer 1

1) mean of sampling distributions for proportions = .58

2) standard error = sqrt[p(1-p)/n] = sqrt[.58(1-.58)/135] = .0425