A political candidate has asked you to conduct a poll to determine what percentage of people support her. a) Suppose the candidate believes that the percentage that support her is approximately 58%. If we want a 7% margin of error at a 94% confidence level, what size sample is needed? b) Suppose the candidate does not know what percentage of people support her. If the candidate wants a 7% margin of error at a 94% confidence level, what size of sample is needed? Round z-values to 2 decimals. Give your answers in whole people.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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A political candidate has asked you to conduct a poll to determine what percentage of people support her.
a) Suppose the candidate believes that the percentage that support her is approximately 58%. If we want a
7% margin of error at a 94% confidence level, what size sample is needed?
b) Suppose the candidate does not know what percentage of people support her. If the candidate wants a
7% margin of error at a 94% confidence level, what size of sample is needed?
Round z-values to 2 decimals. Give your answers in whole people.
Transcribed Image Text:A political candidate has asked you to conduct a poll to determine what percentage of people support her. a) Suppose the candidate believes that the percentage that support her is approximately 58%. If we want a 7% margin of error at a 94% confidence level, what size sample is needed? b) Suppose the candidate does not know what percentage of people support her. If the candidate wants a 7% margin of error at a 94% confidence level, what size of sample is needed? Round z-values to 2 decimals. Give your answers in whole people.
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