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.

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.

Rounding - when the number is bigger ... format 88.1234 to 88.12 , and 0.001234 to 0.0012. ... The confidence interval is the range in which the population parameter is most likely to be found....

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 - Use this calculator to determine a confidence interval for your sample mean where you are estimating the mean of a population characteristic (e.g., the mean blood pressure of a group of patients).

Compute confidence intervals around continuous data using either raw or summary data.

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!

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

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.

The Confidence Interval Calculator calculates both the lower and upper bounds of the interval in which the estimate of a population mean (μ) is likely to fall.

December 25, 2023 - CONFIDENCE INTERVAL Calculator WITH DATA (sigma unknown) Type in the values from the data set separated by commas, for example, 2,4,5,8,11,2. Then type in the confidence level, CL, and hit Calculate. Write the confidence level as a decimal.

September 5, 2025 - Easily calculate the confidence interval for a population mean with our user-friendly Confidence Interval Calculator.

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

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

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.

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

Confidence Interval without using calculator function T-interval:

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. Then hit Calculate and assuming the population is normally distributed, the confidence interval will be calculated for you.

October 11, 2025 - Sample Mean: Standard Deviation: ... is either a sample estimate or a known population value. Enter the Sample Size. Enter the Confidence Level: 95 is the default. Use a number between 0 and 100. For ......

December 2, 2021 - A calculator that finds the confidence interval for a population mean.