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October 20, 2014

Homework Help: statistics

Posted by jr on Monday, October 29, 2012 at 4:01pm.

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 $200 (E = 200)? That is, find n.

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