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This calculator finds the confidence interval for a proportion, based on a provided sample size and number of successes.
Proportion confidence interval calculator with calculation steps, using the normal distribution approximation, binomial distribution, and the Wilson score interval. Both R code and online calculations with charts are available.
Estimate the proportion with a dichotomous result or finding in a single sample. This calculator gives both binomial and normal approximation to the proportion. Instructions: Enter parameters in the green cells. Answers will appear in the blue box below. 1. Binomial "exact" calculation. 2. Normal approximation to the binomial calculation:
Instructions: Use this step-by-step Confidence Interval for Proportion Calculator, by providing the sample data in the form below: Number of favorable cases \((X)\) = Sample Size \((N)\)
CONFIDENCE INTERVAL for proportions Calculator. Fill in the sample size (n), the number of successes (\(x\)), and the confidence level (CL). Write the confidence level as a decimal. For example, for a 95% confidence level, enter 0.95 for CL.
This confidence interval calculator is designed for sampling population proportions. To use it, enter the observed proportion, sample size, and alpha (half of the desired confidence level; so .0025 for a 95% confidence interval).
Powerful confidence interval calculator online: calculate two-sided confidence intervals for a single group or for the difference of two groups. One sample and two sample confidence interval calculator with CIs for difference of proportions and difference of means.