How to Find confidence intervals with a sigma value in Excel

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 80th installment in his "Excel Statistics" series of free video lessons, you'll learn how to construct confidence intervals when the sigma is known known using the CONFIDENCE and NORMSINV functions.