1. Multiple choice (1) Which of the following regression models is not polynomial? A. yZD+x+6 B. y=180+1x+zx2+8 C. y=[)'0+/31/x+3 D.

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1. Multiple choice(1) Which of the following regression models is not polynomial? A. yZfiD+fix+6B. y=180+fi1x+fizx2+8C. y=[)’0+/31/x+3 D. y:130+[J’1x+,6’2x2+fi3x3 +8 3"; : 60 + blx+ 62x2 (2) For the quadratic equation , which of the following expressions must be zero j_J]_._Q_ljd_E}_1_'__t_(_)_ minimize or maximize the predicted y? A. 6&2beB. 251+beC. —bL/(252)D. —52/ (251) j} = 50 + i_'JIJc+62x2 (3) For the quadratic equation , the optimum value of J"; is A. 49052) B. 51/(252)2 D b +£|