SOLUTION: Portly Polls plans on surveying fourth year about still had their original major. They need a 90% confidence level and a margin of error of 1% or less. How many students should be

Question 564991: Portly Polls plans on surveying fourth year about still had their original major. They need a 90% confidence level and a margin of error of 1% or less. How many students should be included in the survey?

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Portly Polls plans on surveying fourth year about still had their original major. They need a 90% confidence level and a margin of error of 1% or less. How many students should be included in the survey?
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n = [z*s/E]^2
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n = [1.645*s/0.01]^2
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Comment: You need a standard deviation to get the number.
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Cheers,
Stan H.
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