A major research organization conducted a national survey to determine what percent of Americans feel that things are getting better for them economically. Asking 1,200 respondents called at random if their own economic situation was better today than last year, 45% reported that they were in fact better off than before.
a. Find the standard error of the proportion.
b. Find the 95% confidence interval for the population proportion.
c. Find the 99% confidence interval for the population proportion.