Are the data in the output reports updated when I reexecute an event?

Yes, the data in the output reports are updated when you reexecute an event.  In order to reexecute an event, you must first press the Reset button on the Event Controller.  This will erase all of your previous results but will not effect input values.  If you did not reset the event, you will just be replaying the results from before you made your changes, and the numeric reports will be identical.