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Estimating the average salary of teachers

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A researcher is interested in estimating the average salary of teachers in a large urban school district. She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050 (σ = 1050), how large of a sample is needed to be accurate within $150 (E = 150)? That is, find n.

Reference no: EM131560025

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