Calculate Sample Size From Standard Deviation. How large a sample should be drawn to estimate with 95 confidence the population mean to within 15. Is the most commonly used estimator for population standard deviation and is generally referred to as simply the sample standard deviation.
How large a sample should be drawn to estimate with 95 confidence the population mean to within 15. As such the corrected sample standard deviation. Okay so I have an exam coming up pretty soon and I really cant get the hang of how to calculate sample size when all you are given is standard deviation.
Feb 26 2010 This formula can be used when you know and want to determine the sample size necessary to establish with a confidence of the mean value to within You can still use this formula if you dont know your population standard deviation and you have a small sample size.
So lets go back to the formula which is n z σMOE 2 One thing you may notice is that the formula has a z value in it. Although its unlikely that you know when the population mean is not known you may be able to determine. A normal population has a standard deviation of 15. Take the square root of your sample size and divide it into your population standard deviation.
