(Answered) A researcher is interested in estimating the average

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A researcher is interested in estimating the average salaries of police officers in a large city. She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to get the desired information and to be accurate within $200

For the confidence interval (5.15, 8.15) what is the margin of error?

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