Researchers conducted an experiment to determine the effects of four different pesticides on the yield of fruit from three different varieties of a citrus tree. Eight trees from each variety were randomly assigned to one of the four pesticides. What is the purpose of this experiment?
1) To determine which pesticide has the greatest effect on fruit yield
2) To determine if there is a difference in fruit yield between the three varieties
3) To determine if there is an interaction between the pesticides and the varieties
4) To determine if there is a difference in fruit yield between the different trees within each variety