Formula To Get Sample Size. This equation is for an unknown population size or a very large population size. First we need to find Z value for the z-table which is 258.
You can use the formula to calculate a sample size for a confidence level of 99 and margin of error -1 01 using the standard deviation suggestion of05. Further information can be found in this article. Collecting research of the complete information about the population is not possible and it is time consuming and expensive.
Jun 02 2015 Example.
Use the sample size formula Plug in your Z-score standard of deviation and confidence interval into the sample size calculator or use this sample size formula to work it out yourself. If youd like to do the calculation by hand use the following formula. The formula does not cover finite population. Here take confidence level as 99 and confidence interval as 001.
