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If the population of voters was 40,000,000, then approximately how big of a sample would a...

If the population of voters was 40,000,000, then approximately how big of a sample would a pollster need to get her estimated population proportion to within a 3% uncertainty (95% confidence)? Note, full credit if you are within 20% of the correct size of sample!   

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Answer #1

When prior estimate for proportion is not specified then p = 0.50

Sample size = Z2/2 * p( 1 - p) / E2

= 1.962 * 0.5 * 0.5 / 0.032

= 1068

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