Confidence Interval Calculator
Free Confidence Interval Calculator online tool. This free online tool calculates the Confidence Interval when the Sample Mean, Sample size, Standard deviation and Confidence level are provided.
A confidence interval is the mean of your estimate plus and minus the variation in that estimate. This is the range of values you expect your estimate to fall between if you redo your test, within a certain confidence level. Confidence, in statistics, is another way to describe probability.