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A home owner wants to estimate the mean diameter of his of 30-year old oak trees. To be 90% confident that the sample mean diameter

A home owner wants to estimate the mean diameter of his of 30-year old oak trees. To be 90% confident that the sample mean diameter is within 2 cm of the population mean diameter, how many trees should be sampled ? A prior study gave a standard deviation of 6.1 cm.

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