The term for changing worksheet cells to see the effects on formulas' outcomes is called What-if analysis. It is a method used in spreadsheets to simulate changes and observe the results.
The process of changing cells in a worksheet to see how those changes affect the outcome of formulas is known as What-if analysis. This computational approach allows users to make hypothetical changes to the data in their spreadsheets and observe how these changes would impact the results of formulas and calculations. For example, if you modify the initial number of cells in a growth calculation, a What-if analysis would show you how that change affects future population projections.