A researcher for the U.S. Department of theTreasury wishes to estimate the percentage of Americans who support
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A researcher for the U.S. Department of theTreasury wishes to estimate the percentage of Americans who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 2 percentage points with 98% confidence if
(a) He uses a 2006 estimate of 15% obtained from a Coinstar National Currency Poll?
(b) He does not use any prior estimate?
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