Question: How large a sample must a pollster take in order to estimate with 95% confidence and to within 3 percentage points, the proportion of voters

How large a sample must a pollster take in order to

How large a sample must a pollster take in order to estimate with 95% confidence and to within 3 percentage points, the proportion of voters who are in favor of a certain measure? Use the information that several years ago the proportion was 0.12

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