Assume 60% of American adults think Martha Stewart is guilty of obstruction of justice and fraud related to insider trading. We will take a random sample of 100 American adults and ask them the question. Then the sampling distribution of the sample proportion of people who answer yes to the question is:
neither Normal, not Binomial.
Approximately Normal, with unknown mean and standard deviation.
Approximately Normal, with mean 0.6 and standard error 0.04899.
Binomial, with n=100 and p=0.60.