For students, researchers, and analysts working with sample data, calculate confidence intervals for means, proportions, and differences between groups. Share your sample size, estimate, and standard deviation or count, and get the calculation steps plus an interpretation that distinguishes the interval from a probability about the population value. Leave with a result you can report and assumptions to check.
Confidence Intervals
Calculate confidence intervals for study estimates and explain what their bounds mean.
Use Confidence Intervals
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What it writes
- Confidence interval with calculation steps
- Plain-language interpretation of the bounds
- Assumptions and method check
How to use it
Include the estimate, sample size, confidence level, and standard deviation or event count in your first message. Name the study design and specify whether groups are paired or independent.
What you bring
- Sample size and sample estimate
- Standard deviation or event count
- Confidence level and study design
- Know which population quantity you are estimating
A good fit for
- Reporting a survey proportion with its margin of error
- Comparing average outcomes between two study groups
- Checking a confidence interval from a statistics assignment
Ways to start
A few requests this Agent can handle.
In a survey of 240 voters, 132 support the proposal. Calculate a 95% confidence interval for the support proportion and explain the result.
My treatment group mean is 18.4, with standard deviation 5.2 and n=36. Calculate a 95% confidence interval for the mean.
Two independent groups have means of 12.1 and 10.3, standard deviations of 4.0 and 3.6, and 40 people each. Estimate a 95% interval for the difference.
Good to know
This workspace provides text assistance.
- Choosing a study design or collecting data
- Calculations use only the numbers and methods you enter
- Cannot verify data against your original study records
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Can I use the response in my work?
Use it as a draft to review and adapt. Verify calculations, facts, rights, and suitability before relying on it. Do not provide information you do not have permission to share.
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