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\[ (-1,7),(1,3),(3,2),(5,1),(7,-3) \] (1) Refer to Problem A. Find the correct equation for the least-squares regression line illustrated in Figure 1. Page 1 of 4 Figure 1: Data and least-squares regression line. (1) \( y=2-1.1 x \) (3) \( y=5.5+1.3 x \) (2) \( y=5.3-1.1 x \) (4) \( y=-5.2-1.1 x \) (2) Refer to Problem A. Use the computing formula to find \( S_{x x} \). (1) 85 (3) 40 (2) 132 (4) 225 (3) A study in green energy collects data about hours of sunlight on a given day and amount of electricity generated by a particular type of solar cell. Identify the 'dependent' variable in this study. (1) The green energy project. (2) Hours of sunlight on a given day. (3) Amount of electricity generated by the particular type of solar cell. (4) Which of the equations below is the appropriate model when the data exhibit a linear relationship? (1) \( y=\alpha+\beta x \) (3) \( y=\beta x+\epsilon \) (2) \( y=\alpha+\beta x+\gamma x^{2}+\epsilon \) (4) \( y=\alpha+\beta x+\epsilon \)

x y x2 y2 xy -1 7 1 49 -7 1 3 1 9 3 3 2 9 4 6 5 1 25 1 5 7 -3 49 9 -21 Sum 15 10 85 72 -14 Mean 3 2 1) slope of regression line is slope,?1=n?xy??x?yn