SOLUTION: #8 A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 6% margin of error at a 90% confidenc

Question 1120131: #8
A political candidate has asked you to conduct a poll to determine what percentage of people support her.
If the candidate only wants a 6% margin of error at a 90% confidence level, what size of sample is needed?
Give your answer in whole people.

Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
there is not enough information to solve this problem without making certain assumptions
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if you were given the standard deviation of the population, it is solvable
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assume the population is large, say 100,000 and the proportion is 50% of the population supports the candidate
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then the formula for sample sizing using the proportion formula yields an answer of 188
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note that the sample size does not increase appreciably with populations greater than 100,000
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