Sample Size Calculator :
Discover the capabilities of our Sample Size Calculator. Easily calculate the sample size for your study with precision and certainty. Our program offers step-by-step options for calculating standard deviations and proportions, adapted to specific research needs.
How to Use the Sample Size Calculator
- Select the type of calculation based on your study's requirements: \(\sigma\) given, \(\sigma_1\) and \(\sigma_2\) given, \( \mathrm{p} \) given, or \( \mathrm{p_1} \) and \( \mathrm{p_2} \) given.
- Enter the margin of error you want to achieve in your study.
- Based on your selection, input the required statistical parameters.
- Enter the confidence level as a percentage (e.g., 95 for 95% confidence).
- Click on "Calculate sample size" to get your result.
How to find sample size
Select Calculation Type:
Determine the statistical scenario of your study:
- \(\sigma\) given: If you know the population standard deviation.
- \(\sigma_1\) and \(\sigma_2\) given: If you have standard deviations from two groups.
- \(p\) given: If you know the population proportion.
- \(p_1\) and \(p_2\) given: If you have proportions from two groups.
Enter Margin of Error:
Define the margin of error you can tolerate in your study.
Provide Statistical Parameters:
Depending on your chosen calculation type, enter:
- Standard deviation(s) (\(\sigma\), \(\sigma_1\), \(\sigma_2\)) or proportion(s) (\(p\), \(p_1\), \(p_2\)).
- Confidence level (usually as a percentage, e.g., 95%).
Calculate:
Click on "Calculate sample size" to obtain the required sample size.
Interpret Results::
The tool will provide you with the calculated sample size needed for your study based on the input parameters.
These steps ensure that you can determine an appropriate sample size that balances statistical accuracy with practical feasibility for your research or study design. Adjustments may be necessary based on specific study requirements or constraints.