A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 99% confident that her estimate is correct. If the standard deviationis 4.4, how large a sample is needed to get the desired information to be accurate within 0.65 decibels? Show all work.
The solution provides a step-by-step method for the calculation of sample size for the population mean. The formula for the calculation and interpretations of the results are also included. An interactive excel sheet is provided as an attachment. The user can edit the inputs and obtain the complete results for a new set of data using the excel spreadsheet. The solution is written out in chart form in a Word document which is attached.