How many respondents needed to calculate confidence interval


In a public opinion poll, 48% of 189 respondents favor an elimination of taxes on dividend income.

How many respondents would be needed to calculate a 95% confidence interval (for the proportion of people who favor an elimination of taxes on dividend income) that has a total width no greater than 4% (i.e., the estimate must be within +/- 2% of the true population proportion)?

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