## Plus Four Confidence Interval for Proportion

Use this calculator to compute the plus four confidence interval for population proportion.

Confidence Interval Calculator for proportion | |
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Sample Size ($n$) | |

Number of successes ($k$) | |

Confidence Level ($1-\alpha$) | |

Results | |

Estimate of proportion: ($\hat{p}$) | |

Standard Error of proportion: ($SE$) | |

Z-critical value: ($Z_{\alpha/2}$) | |

Margin of Error: ($E$) | |

Lower Confidence Limits: | |

Upper Confidence Limits: | |