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7: Confidence Interval for a Population Proportion

Last updated

May 10, 2025
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- 6: Linear Correlation and Regression
- 8: Sample Size to Estimate a Population Proportion

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Confidence Interval for a Population Proportion

This calculator creates confidence intervals for a population proportion given statistics. Please report the error to Dr. Jessica Kuang at jkuangATvcccd.edu.

To learn how to use this calculator, please watch a short video here.

Input

Fill in the sample size ( $n$ ), the number of successes ( $x$ ), and the confidence level (CL), then hit Calculate. Write the confidence level as a decimal. For example, for a 95% confidence level, enter 0.95.

Sample Size (

$n$ ):

Number of Successes (

$X$ ):

Confidence Level (enter a decimal):

Output

Point Estimate (

$\hat{p}$ ):

Lower Bound:

Upper Bound:

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