SOLUTION: A political candidate has asked you to conduct a poll to determine what percentage of people support her.
If the candidate only wants a 3% margin of error at a 99% confidence le
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If the candidate only wants a 3% margin of error at a 99% confidence le
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Question 1166657: A political candidate has asked you to conduct a poll to determine what percentage of people support her.
If the candidate only wants a 3% margin of error at a 99% confidence level, what size of sample is needed?
Give your answer in whole people.
You can put this solution on YOUR website! half-interval is z(0.995)*sqrt(p*(1-p)/n) use p=0.5 as the most conservative estimate. z=2.576
half-interval is 2.576 * sqrt (.25)/n and that equals 0.03
square both sides and 0.0009=6.634*.25/n
so 0.0009n=1.6585
n=1842.77 or 1843
