Question: In a study of taste aversion, 10 lab rats were fed twice a day but their diet alternated between a sugar-flavored and a chocolate-flavored mash. As determined by amount eaten, the rats found the two mixtures equally palatable. After several weeks on these diets, the rats were injected with a chemical immediately after consuming the chocolate-flavored mash. The chemical made the rats temporarily ill. During the next feeding cycle, the amount of each type of food that each rat ate was recorded (it is shown below). How would you test whether the chemically-induced illness reduced the palatability of the chocolate-flavored mash?

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