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, how large a sample is needed to be accurate within $100?© BrainMass Inc. brainmass.com June 3, 2020, 4:53 pm ad1c9bdddf
Lower Limit = Mean - Z*Std Dev/n^.5
<br>Upper Limit = Mean + Z*Std ...