## 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 …

## Confidence Interval For Population Variance Calculator

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. Calculator Confidence Interval for Variance Calculator Sample Size ($n$) Sample Standard Deviation ($s$) Confidence Level ($1-\alpha$) Select90%95%98%99% Calculate Confidence Interval for Variance Results Degrees of Freedom : (df) Chi-square critical value 1: …

## CI Calculator for difference between means-examples

Confidence interval calculator for difference of means Use this calculator to determine the confidence interval for difference between means when variances are known. Confidence Interval Calculator for Difference of means   Sample 1 Sample 2 Sample Mean Sample Size Population Standard Deviation Confidence Level ($1-\alpha$) Select90%95%98%99% Calculate Results Standard Error of Diff. of Means: Z-critical …

## Confidence Interval for Population Proportion Calculator

Confidence Interval for Population Proportion Calculator Confidence interval for population proportion calculator computes estimate of proportion,standard error of proportion,Z-critical value,margin of error,lower and upper confidence limits based on sample size,number of successes and confidence level input values. Confidence Interval for population proportion calculator Sample Size ($n$) Number of successes ($k$) Confidence Level ($1-\alpha$) Select90%95%98%99% Calculate …

## Confidence Interval for Mean (t) Calculator

Confidence Interval For Mean (t)-calculator 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 ($1-\alpha$) Select90%95%98%99% Calculate Results Standard Error of Mean: ($SE$) t-critical value: ($t_{\alpha/2,n-1}$) Margin of Error: …

## Confidence Interval for Mean Calculator

Confidence Interval for Mean-Calculator 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 ($1-\alpha$) Select90%95%98%99% Calculate Results Standard Error of Mean: Z Critical Value : ($Z$) Margin of Error: …

## Confidence interval for ratio of variances

Confidence Interval for ratio of variances Let $X_1, X_2, \cdots , X_{n_1}$ be a random sample of size $n_1$ from $N(\mu_1, \sigma_1^2)$ and $Y_1, Y_2, \cdots , Y_{n_2}$ be a random sample of size $n_2$ from $N(\mu_2, \sigma_2^2)$. Moreover, $X$ and $Y$ are independently distributed. $100(1-\alpha)$% confidence interval estimate of ratio of variances is  …

## Confidence Interval for ratio of variances Examples

Confidence Interval for ratio of variances In this tutorial we will discuss some examples on confidence interval for ratio of variances. Example 1 The same capacity of hard drive is manufactured on two different machines, Machine A and Machine B. Samples are taken from both machines and sample mean manufacturing times and sample variances are …

## Confidence Interval for means when variances are known

In this article we will discuss about the theory of confidence interval for difference between two means when population standard deviations are knonw along with the step by step procedure to construct a confidence interval for difference between two population means when the population standard deviations are known. CI for difference between two means when …

## Confidence interval for two proportions examples

Confidence interval for two proportions examples In this tutorial we will discuss some examples on confidence interval for difference between two population proportions. Example 1 A random sample of 85 parts manufactured by machine A yields 10 defective and a random sample of 110 parts manufactured by machine B shows 28 defective. Compute 95% confidence …