Calculator to compute the confidence interval or margin of error of a sample based on the desired confidence level. It also provides an error bar diagram.

Mar 21, 2025 · Follow the steps below to calculate the confidence interval for your data. Write down the phenomenon you'd like to test. Let's say you're working with the following situation: …

confidence level Calculator. Computes the mean confidence interval and the standard deviation confidence interval using the confidence level and raw data or sample statistics. Both R code …

Jul 1, 2025 · In this article, we will explain what a confidence level is, how to calculate it, and where it’s used in the real world.

The confidence interval calculator finds the confidence level for your data sample.

Confidence Level = (1 – α) × 100. Where: α = significance level = probability of making a Type I error. The relationship between margin of error and confidence level is: E = Z × (σ / √n) …

Enter how many in the sample, the mean and standard deviation, choose a confidence level, and the calculation is done live. Read Confidence Intervals to learn more. Use the Standard …