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You are asked to estimate the average height of black spruce trees in a 1,000 ha plot. How large must your sample be to have

You are asked to estimate the average height of black spruce trees in a 1,000 ha plot. How large must your sample be to have 99% confidence that your estimate is within 0.5 m? A study conducted last year, in a nearby location determined that the standard deviation of tree heights is 1.10 m.

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