Lynette Mann describes the use of Data Tables in Microsoft Excel 2010. A data table is a range of cells in which the user can change values in some in some of the cells and come up with different answers to a problem. A one-variable data table allows the user to see how different values of one variable in one or more formulas will change the results of those formulas. A two-variable data table is used to see how different values of two variables in one formula will change the results of that formula.