**1. Steps to Use this Tool:**

**Step 1:**Enter the desired confidence level as a percentage into the “Enter Confidence Level (%)” input field.**Step 2:**Enter the margin of error as a percentage into the “Enter Margin of Error (%)” input field.**Step 3:**Enter the population proportion as a percentage into the “Enter Population Proportion (%)” input field.**Step 4:**Click on the “Calculate Sample Size” button to compute the required sample size.**Step 5:**View the calculated sample size displayed below the button.

**2. Information about the Tool:**

The Sample Size Calculator is a web-based tool designed to determine the sample size required for a survey or experiment based on the desired confidence level, margin of error, and population proportion. It uses the formula 𝑛=𝑧^{2}⋅𝑝q/e^{2} where:

*n*is the required sample size.*z*is the z-score corresponding to the desired confidence level.*p*is the population proportion.*q*is 1−𝑝1−*p*(complement of the population proportion).*e*is the margin of error.

**3. Benefits of Using this Tool:**

**Precision:**Calculates the sample size needed to achieve a specified margin of error and confidence level, ensuring statistical accuracy.**Efficiency:**Saves time by automating the calculation process, eliminating the need for manual computations.**Flexibility:**Allows users to customize the input parameters according to their specific study requirements.**User-Friendly:**Simple interface with clear instructions, making it accessible for users with varying levels of statistical knowledge.

**4. FAQ (Frequently Asked Questions):**

**Q:**What is a confidence level?**A:**The confidence level represents the probability that the true population parameter lies within the calculated confidence interval. Commonly used confidence levels include 90%, 95%, and 99%.**Q:**What is the margin of error?**A:**The margin of error indicates the range within which the sample statistic is expected to deviate from the true population parameter. It is usually expressed as a percentage of the sample statistic.**Q:**What is the population proportion?**A:**The population proportion is the estimated proportion of the population possessing a certain characteristic or attribute of interest. It serves as one of the input parameters for sample size calculation.**Q:**How is the z-score determined?**A:**The z-score is determined based on the desired confidence level. It represents the number of standard deviations from the mean in a standard normal distribution and is used to calculate the confidence interval.

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