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An wine association wants to determine the proportion of west coast consumers who would spend at least $30 on Valley Wine pinot noir at a

An wine association wants to determine the proportion of west coast consumers who would spend at least $30 on Valley Wine pinot noir at a 99% confidence level.
If they wish to have an error of no more than 5%, how large a sample must they take? Based on surveys of cruise passengers that have visited the wineries, the association estimates that the proportion is around 0.15.
what sample size is needed?

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