Confidence Interval Calculator

Determine the true mean of a population with a calculated margin of error based on your sample data.

Margin of Error
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Lower Bound
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Upper Bound
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Results will be displayed here.

About the Confidence Interval Calculator

The Confidence Interval Calculator from TechnoCodex is a statistical tool that helps you estimate the true mean of a population from a sample of data. By providing a sample mean, standard deviation, and sample size, this calculator determines a range of values that likely contains the actual population mean, along with a margin of error.

How to Use the Calculator

  1. Sample Mean (x̄): Enter the average of your sample data.
  2. Standard Deviation (s): Enter the standard deviation of your sample.
  3. Sample Size (n): Enter the number of items in your sample.
  4. Confidence Level: Select your desired confidence level (e.g., 95%). This reflects how confident you want to be that the true mean falls within the calculated interval.
  5. Click the “Calculate” button to see the results.

Frequently Asked Questions (FAQs)

What is a confidence interval?
A confidence interval is a range of values, derived from sample statistics, that is likely to contain the value of an unknown population parameter. It expresses the level of uncertainty associated with a sample estimate.

What does a 95% confidence level mean?
A 95% confidence level means that if you were to take 100 different samples and compute a 95% confidence interval for each sample, then approximately 95 of the 100 confidence intervals will contain the true population mean.

Is this tool free to use?
Yes, this Confidence Interval Calculator is 100% free to use. All calculations are performed in your browser, and your data is not stored.

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