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QUESTION

A study is trying to estimate the proportion of people that believe in a hoax. Given that z(/2)=2.

A study is trying to estimate the proportion of people that believe in a hoax. Given that z(α/2)=2.575, what size sample should be used to estimate in order to be within 5% with 99% confidence if we do not use a prior estimate? What if we use a prior estimate of 0.25 from last year?

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