[MidA] Karla works as a salesperson at an automobile dealers…
Karla works as a salesperson at an automobile dealership that sells sporty cars, family sedans, vans, and pick-up trucks. George, the owner, wants his salespeople to sell more “extra features” on the vehicles they sell. George offers a $500 bonus to whichever salesperson sells the most extra features each month. The first month, Karla sells the most extra features and receives the bonus. Karla now tends to sell more extra features on each automobile she is selling. In the third month of the incentive program, this year’s new car models arrive to the dealership. During the fourth month of the program, Karla sells the fewest extra features of any salesperson at the dealership. Which of the following is most likely to be an extraneous variable in this scenario?