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A local Christmas tree farm is collecting sample to measure if their trees are able to meet the strict requirements by Walmart on the height

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A local Christmas tree farm is collecting sample to measure if their trees are able to meet the strict requirements by Walmart on the height of the trees. If they want to be 99% condent that the sample estimate was no more than :i: 2 feet away from the true average height, what sample size is needed? Past data have indicated that the standard deviation of tree height is approximately 4 feet

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