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A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 7% margin of error at a 95% confidence level, what sample size is needed? (Note: round your z-score to three decimal places.)

A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 7% margin of error at a 95% confidence level, what sample size is needed? (Note: round your z-score to three decimal places.)

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 7% margin of error at a 95% confidence level, what sample size is needed? (Note: round your z-score to three decimal places.) [Text Box for Answer Input] [Submit Question Button]
Transcribed Image Text:A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 7% margin of error at a 95% confidence level, what sample size is needed? (Note: round your z-score to three decimal places.) [Text Box for Answer Input] [Submit Question Button]
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GivenMargin of error=0.07confidence interval(c)=95%Let us assumep^=0.51-p^=1-0.5=0.5α=1-0.95=0.05α2=0.025zα2=z0.025=1.96  (from standard normal table)

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