A psychologist teaching introductory psychology wanted to demonstrate the effects of mere exposure on liking. On the first day of class, she used individual monitors to show each of her 20 students a very abstract piece of modern art and asked them to rate how much they liked it on a scale ranging from ˆ’10 (extremely dislike) to +10 (extremely like). She then showed them the piece of art at the start of each class for the rest of the semester. At the middle, and again at the end, of the semester, she had the students individually rate their liking of the picture. Here are the results:

Given SS_Subjects = 176.67, SS_Treatment = 640.13, and SS_Residual = 140.53, complete the appropriate statistical test and interpret the results. (Don€™t forget to follow all six steps of the hypothesis test.)

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First Class Mid-semester Last Class -6.30 -2.40 1.70 2.35 1.75 2.85