suppose a researcher wants to estimate the proportion of potential voters who support a law that forbids smoking in public with a margin of error of 3 how many potential voters must be surveyed if we want a 95 confidence interval

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Suppose a researcher wants to estimate the proportion of potential voters who support a law that forbids smoking in public, with a margin of error of 3%. How many potential voters must be surveyed if we want a 95% confidence interval?