The calculator above computes confidence intervals and hypothesis tests for the difference between two population means.

Use this calculator to determine the precision of your survey results. Enter key values from your survey below and we'll calculate the margin of error.

The margin of error is calculated by using this formula: n = sample size • σ = population standard deviation • z = z-score (you can also use the calculator ...

Input your survey data into our easy-to-use calculator, or experiment with the numbers to see how they impact margin of error. Margin of error calculator · What is margin of error?

Confidence interval calculator for the difference between two proportions with calculation steps, using the normal distribution approximation.

Determine the precision of your survey findings with this margin of error calculator. Enter key survey values below, and we will compute the margin of error.

An easy confidence interval calculator for estimating the mean difference between two populations. Provides full details of workings.

Step 1: Identify the standard deviation for both samples, σ 1 and σ 2 , and the sample sizes n 1 and n 2 . Step 2: Use a z-table to find the z-score for the ...

This procedure calculates the difference between the observed means in two independent samples. A significance value (P-value) and 95% Confidence Interval (CI) ...

Calculates the confidence interval for the difference between two population means: equal variances, unequal variances, and paired groups.