In a regression analysis involving 30 observations, the following estimated regression equation was obtained. ý = 17.6 + 3.4x, – 2.5x, + 7.9x3 + 2.9×4 (a) Interpret b, in this estimated regression equation. O b, = -2.5 is an estimate of the change in y corresponding to a 1 unit change in x, when x2, X3, and x, are held constant. O b, = 3.4 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, X3, and x4 are held constant. O b, = 7.9 is an estimate of the change in y corresponding to a 1 unit change in x, when x,,x2, and x, are held constant. O b O b = 2.9 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, x2, and x3 are held constant. = 3.4 is an estimate of the change in y corresponding to a 1 unit change in x, when x2, x3, and x, are held constant. Interpret b, in this estimated regression equation. O bz = -2.5 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, x3, and x4 are held constant. b2 = 2.9 is an estimate of the change in y corresponding to a 1 unit change in x4 when x,, x2, and x3 are held constant. = -2.5 is an estimate of the change in y corresponding to a 1 unit change in x2 when x, x3, and x, are held constant. b2 = 3.4 is an estimate of the change in y corresponding to a 1 unit change in x, when x2, x3, and x, are held constant. %3D b2 = 7.9 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, x2, and x, are held constant. %3D Interpret b, in this estimated regression equation. O bz = 3.4 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, x2, and x4 are held constant. O b3 = -2.5 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, x3, and x4 are held constant. O bz = -2.9 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, x2, and x, are held constant. O bz = 7.9 is an estimate of the change in y corresponding to a 1 unit change in x, when x,,x3, and x, are held constant. O bz = 7.9 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, x2 and x4 are held constant. Interpret b, in this estimated regression equation. O b, = 7.9 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, X3, and x3 are held constant. O b, = 2.9 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, X2, and x3 are held constant. O bą = 2.9 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, x2 and x4 are held constant. %3D O bą = 3.4 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, x2 and x3 are held constant. %3D O b4 = -2.5 is an estimate of the change in y corresponding to a 1 unit change in x, when x,, xX3, and x, are held constant. (b) Predict y when x, = 10, x, = 5, x3 = 1, and x4 = 2.