How to Construct confidence intervals with Excel's NORMSINV
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 85th installment in his "Excel Statistics" series of free video lessons, you'll learn how to construct confidence intervals for proportions using NORMSINV function and other formulas.