In a random sample of n = 900 registered voters, 475 prefer Clinto for Governor.

a) What is the point estimate of the population proportion of registered voters preferring Hardcastle

b) What is the estimate of the standard deviation of the sampling distribution of the sample proportion?

c) The "margin of error" for a 95% confidence interval is 1.96 times this standard deviation. So here the margin of error is ?

d) The 95% confidence interval is the point estimate, plus or minus the margin of error. So what is this interval for the population proportion of individuals preferring Clinton?