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The regression model y_hat = 150 + 8x1 - 3x2 has been fitted to a set of data. If x2 = 15, what will be the effect on y_hat if x1 increases by 2 units? Will your answer change if x2 = 20? Give the preceding, comment on whether interaction appears to exist between x1 and x2. Answer all 3 questions and give the comments.