Excel's built-in statistical functions can be supplemented with the Analysis Toolpak. If you are not sure how to load an Add-In into Excel, this video demonstrates the simple technique and shows you how to get started with the Analysis Toolpak....
Excel's Scenario Manager conveniently keeps track of several different sets of values that can be plugged into a worksheet to examine the consequence of changes. For example, we might want to examine growth under several potential changes in unemployment...