For our formula we have a standard deviation of 17 a multiplier of 2576from the powerpoint and a margin of error of 5. The margin of Error Formula The formula for the margin of error is calculated by multiplying a critical factor for a certain confidence level with the population standard deviation and then the result is divided by the square root of the number of observations in the sample. The minimum sample size formula can be found in most elementary statistics texts.
Pearson Education Inc 2008 p.
The formula for margin of error when estimating a population mean is where z is the value from the table for a given confidence level 95 in this case or 196 is the standard deviation 3 years and n is the sample size 50. The formula appears in M. PThe Margin of Error is 4. The formula for margin of error when estimating a population mean is where z is the value from the table for a given confidence level 95 in this case or 196 is the standard deviation 3 years and n is the sample size 50.
