What is the Sample Size Calculator?

The Sample Size Calculator is a statistical tool that helps users determine the minimum number of observations required for a study or survey to achieve a desired confidence level and margin of error. By entering the population standard deviation, desired margin of error, and confidence level, the calculator computes the z-value and required sample size. This ensures that your results are statistically reliable and representative of the population, making it useful for researchers, analysts, and students.

How to Use:

1. Enter Population Standard Deviation (σ): Input the estimated or known standard deviation of the population.
2. Enter Margin of Error (E): Input the acceptable margin of error for the estimate.
3. Enter Confidence Level (%): Input the desired confidence level (e.g., 90, 95, 99).
4. Click “Calculate”: The tool calculates the z-value and required sample size based on the inputs.
5. Review Result: The output displays the z-value, required sample size, and provides an interpretation, indicating how many samples are needed to achieve the specified confidence level with the chosen margin of error.