Confidence Interval with Known Variance – Excel Template

Ned Krastev
Ned Krastev

Calculating a confidence interval allows us to get an idea about the possible range of realizations of a random variable with a reasonable degree of certainty. If the population variance is known, the population mean will fall between the sample mean minus z of, alpha divided by 2, times the standard error, and, the sample mean plus z of, alpha divided by 2, times the standard error.

If you’re a sales executive, you might want to calculate a range for your sales next quarter with 95% certainty.

This is an open-access Excel template in XLSX format that will be useful for anyone who wants to work as a Statistician, Business Intelligence Analyst, Data Scientist, Portfolio Manager, or Risk Manager.

You can now download the Excel template for free.

The Confidence Interval is among the topics included in the Quantitative Methods module of the CFA Level 1 Curriculum.