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A private opinion poll is conducted for a politician to determine what proportion of the population...

A private opinion poll is conducted for a politician to determine what proportion of the population favors adding more national parks. How large a sample is needed in order to be ​95% confident that the sample proportion will not differ from the true proportion by more than ​5%?

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Answer #1

Ans : Given that 5% confident interval  sample proportion will not differ from the true proportion by more than ​5%

= 0.05

and Margin of error = 0.05

therefore n= 384  

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