Question: A study needs to be done to estimate the percentage of citizens of a large city who are in favor of water being treated with

A study needs to be done to estimate the percentage of citizens of a large city who are in favor of water being treated with flowers. How large a sample should you select if you want to be 95% confident that the estimate is within 6% of the true percentage?

A study is needed to estimate the percentage of citizens of a large city who are in favor of water being treated with fluoride. How large should the sample you need to select be if you want to have 95% confidence that the estimate is within 6% of the actual percentage?

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