## Plus Four Confidence Interval for Proportion Calculator

Plus Four Confidence Interval for Proportion Calculator Use this calculator to compute the plus four confidence interval for population proportion. Plus Four Confidence Interval Calculator Sample Size ($n$) Number of successes ($k$) Confidence Level ($1-\alpha$) Select90%95%98%99% Calculate Results Estimate of proportion: ($\hat{p}$) Standard Error of proportion: ($SE$) Z-critical value: ($Z_{\alpha/2}$) Margin of Error: ($E$) Lower …