This calculator will compute the 99%, 95%, and 90% confidence intervals for the mean of a normal population, given the sample mean, the sample size, and the sample standard deviation.

Use this calculator to compute the confidence interval or margin of error, assuming the sample mean most likely follows a normal distribution. Use the Standard Deviation Calculator if you have raw data only. A confidence interval is a statistical measure used to indicate the range of estimates within which an unknown statistical parameter is likely to fall. If the parameter is the population mean, the confidence interval is an estimate of possible values of the population mean.

An easy confidence interval calculator using a Z statistic to estimate a population mean from a single sample. Provides full details of workings.

February 24, 2016 - If the blood pressure of a further 900 adults were measured then this confidence interval would reduce to between 69.51 and 70.49mmHg (assuming the estimated mean and standard deviation remained the same). This calculator uses the following formula for the confidence interval, ci: ... Zα/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96), μ is the sample mean, s is the sample standard deviation, n is the sample size and N is the population size.

Excluded - The calculator will exclude the outliers before calculating the average and the standard deviation.You should remove outliers only if you identify them as invalid observations! Confidence Level (CL) - The certainty level that the true value of the estimated parameter will be in the confidence interval. Do you know the population SD (σ)? - this option relevant for the mean ...

December 18, 2023 - Fill in the sample size (n), the sample mean (\(\bar{x}\)), the sample standard deviation (s), and the confidence level (CL). Write the confidence level as a decimal. For example, for a 95% confidence level, enter 0.95 for CL.

September 5, 2025 - Easily calculate the confidence interval for a population mean with our user-friendly Confidence Interval Calculator. ... Input your sample mean, sample standard deviation, and sample size. Select your desired confidence level (e.g., 95%) from the dropdown menu. Click the "Calculate" button to get your results instantly. A confidence interval is a statistical range, estimated from observed data, that is likely to cover an unknown population parameter.

Confidence Interval Calculator by Duplichecker helps you to calculate the population mean from a single sample & you will get value of confidence interval.

Analytics Calculators better insights and decisions, one calculation at a time! ... Compute the 90%, 95%, and 99% confidence intervals for the mean of a normal population, given the sample standard deviation, the sample mean, and the sample size.

An easy confidence interval calculator for estimating a population mean from a single sample. Provides full details of workings.

Statistical calculators, sample size, free, confidence interval, proportion, mean

Compute confidence intervals around continuous data using either raw or summary data · 3300 E 1st Ave. Suite 370 Denver, Colorado 80206 United States

This calculator helps you estimate the true population mean with a specified level of confidence, providing both precision and uncertainty measures for your data. It automatically determines whether to use z-test or t-test methods, handles both raw data uploads and manual statistic entry, and provides comprehensive results including confidence intervals...

This calculator will compute the 99%, 95%, and 90% confidence intervals for the mean of a normal population when the population standard deviation is known, given the sample mean, the sample size, and the population standard deviation.

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

Confidence Interval without using calculator function T-interval:

Statistical calculators, sample size, free, confidence interval, proportion, mean

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 Deviation Calculator to calculate your sample's standard deviation and mean. Caution: you should really use the standard deviation of the entire population!

Do you need to find a Confidence Interval Calculator quickly? Input your data to obtain the metric, step-by-step calculation, Python and R codes, and more. Calculate now.