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Confidence Interval Calculators

Confidence Interval for mean Calculator

  • STATISTICS
Confidence Interval for Mean (Z) Use this calculator to compute the confidence interval for population mean when the population standard deviation is known. Confidence Interval Calculator for mean Sample Size ($n$) Sample Mean ($\overline{x}$) Population Standard Deviation ($\sigma$) Confidence Level ($1-\alpha$) Select 90% 95% 98% 99% Calculate Results Standard Error of Mean: Z Critical Value : ($Z$) Margin of Error: ($E$) Lower Confidence Limits: Upper Confidence Limits:

Confidence Interval for mean t Calculator

  • STATISTICS
Confidence Interval For Mean (t) Use this calculator to compute the confidence interval for population mean when the population standard deviation is unknown. Confidence Interval Calculator for mean Sample Size ($n$) Sample Mean ($\overline{x}$) Sample Standard Deviation ($s$) Confidence Level ($1-\alpha$) Select 90% 95% 98% 99% Calculate Results Standard Error of Mean: ($SE$) t-critical value: ($t_{\alpha/2,n-1}$) Margin of Error: ($E$) Lower Confidence Limits: Upper Confidence Limits:

Confidence Interval for means t equal variances Calculator

  • STATISTICS
Confidence Interval for Difference of Means (t) equal variances Confidence Interval Calculator for Difference between means   Sample 1 Sample 2 Sample Mean Sample Size Standard Deviation Confidence Level ($1-\alpha$) Select 90% 95% 98% 99% Calculate Results Standard Error of Diff. of Means: Degrees of Freedom: t-critical value: ($t_{\alpha/2,df}$) Margin of Error: ($E$) Lower Confidence Limits: Upper Confidence Limits:

Confidence Interval for means t unequal variances Calculator

  • STATISTICS
Confidence Interval for Difference of Means (t) Unequal variances Confidence Interval Calculator for Difference between means   Sample 1 Sample 2 Sample Mean Sample Size Standard Deviation Confidence Level ($1-\alpha$) Select 90% 95% 98% 99% Calculate Results Standard Error of Diff. of Means: Degrees of Freedom: t-critical value: ($t_{\alpha/2,df}$) Margin of Error: ($E$) Lower Confidence Limits: Upper Confidence Limits:

Confidence Interval For Population Variance Calculator

  • STATISTICS
Confidence Interval For Population Variance Calculator Use below Confidence interval for population variance calculator to calculate degees of freedom,chi-square critical values, confidence limits based on input sample size,sample standard deviation and confidence interval (90%,95%,98% or 99%) Confidence Interval for Variance Calculator Confidence Interval for Variance Calculator Sample Size ($n$) Sample Standard Deviation ($s$) Confidence Level ($1-\alpha$) Select 90% 95% 98% 99% Calculate Confidence Interval for Variance Calculator Results Degrees of Freedom : (df) Chi-square critical value 1: Chi-square critical value 2: Lower Confidence Limits: Upper Confidence Limits: How to use Confidence Interval for Variance Calculator?

Confidence Interval for proportion Calculator

  • STATISTICS
Confidence Interval for Proportion Use this calculator to compute the confidence interval for population proportion. Confidence Interval Calculator for proportion Sample Size ($n$) Number of successes ($k$) Confidence Level ($1-\alpha$) Select 90% 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 Confidence Limits: Upper Confidence Limits:

Plus Four Confidence Interval for proportion Calculator

  • STATISTICS
Plus Four Confidence Interval for Proportion Use this calculator to compute the plus four confidence interval for population proportion. Confidence Interval Calculator for proportion Sample Size ($n$) Number of successes ($k$) Confidence Level ($1-\alpha$) Select 90% 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 Confidence Limits: Upper Confidence Limits: