Aresearcher representing a small-town mayor wants to know how many total phone calls she needs to make in order to estimate the mayor’s approval rating. respondents will be asked, "do you approve of the mayor? " and they will respond either "yes" or "no". the researcher wants a low standard level of confidence. the researcher will be satisfied with a margin of error of ±3%. 4,000 people live within the city limits (the study only applies to those that live within the city limits). last year, the researcher completed 1 phone survey for every 4 people that were called. in order to get the required sample size, how many phone calls will she have to make?