A confidence interval is an indicator of your measurement’s precision. It is also an indicator of how stable your estimate is, . When you compute a confidence interval on the mean, you compute the mean of a sample in order to estimate the mean of the population.

If you know the standard deviation for a population, then you can calculate a confidence interval (CI) for the mean, or average, of that population. How to calculate the confidence interval and what it means. To compute a confidence interval, you first need to determine if your data is continuous or discrete binary. Strictly speaking a confidence interval means that if we were to take 1different samples and compute a confidence interval for each sample, then .

Before using the sample size calculator, there are two terms that you need to know. These are: confidence interval and confidence level. Enter how many in the sample, the mean and standard deviation, choose a confidence level, and the calculation is done live. This lesson explains what a confidence interval is and explains how to construct and interpret.

Often, the margin of error is not given; you must calculate it. A confidence interval gives an estimated range of values which is likely to include an unknown population parameter, the estimated range being calculated from . Confidence Level: (Enter the confidence level between and 1). Sample Size: Sample Standard Deviation: Sample Mean: . This calculator will compute the , , and confidence intervals for the mean of a normal population, given the sample mean, the sample size, and the .

Here we look at some examples of calculating confidence intervals. The examples are for both normal and t distributions. While the theory behind how confidence intervals and what they mean/how to.

Use this information to calculate a confidence interval for the mean credit . In statistics, a confidence interval (CI) is a type of interval estimate of a population parameter. From the same data one may calculate a confidence interval, which in this case might be to. A major factor determining the length of . This page will calculate the lower and upper limits of the confidence interval for the difference between two independent proportions, according to two . Mean = Lower bound: Upper bound: This calculator includes functions from the jStat JavaScript library. Statistical formulae for calculating some confidence intervals.

Instea the level of confidence is associated with the method of calculating the interval. The confidence coefficient is simply the proportion of samples of a given .