Timetech, Inc., has been experimenting with different approaches to improving the performance of its field sales force. In a test involving salespersons in Maine, the company found that giving sales leaders a free snowmobile caused a sales increase of 25% in that state. The experiment in Maine was so successful that company executives are now planning to increase sales nationwide by awarding free snowmobiles to sales leaders in all 50 states. Critique the external validity of this experiment.