A candidate for an upcoming election is expected to capture 75% of the votes. To get a better idea of his chances, his team wants to collect a random sample from the voters and compute a 95% confidence interval for the actual percentage in his favor. (a) Using the Wald formula, what sample size is required to estimate the population percentage in favor with an error of no more than 4%? Note: the "error" is the part added to and subtracted from the estimate. (b) Using your sample size above, suppose the observed sample percentage is 70%. Compute and interpret the 95% confidence Wald interval