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4. How many respondents should have been interviewed if they had wanted to guarantee that the maximum error due to sampiing for results based on

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4. How many respondents should have been interviewed if they had wanted to guarantee that the maximum "error due to sampiing for results based on the entire sample\" (a.k.a. margin of error) is u +/- 1% with 95% confidence; u +/- 3% with 99.7% confidence

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