Suppose That the Sample Regression Equation of a Second-Order Model $= 2.50 + 0.15 x + 0.45 x ^ { 2 }$

Multiple Choice

Suppose that the sample regression equation of a second-order model is $= 2.50 + 0.15 x + 0.45 x ^ { 2 }$ . The value 4.60 is the:

A) predicted value of y for any positive value of x.
B) predicted value of y when x = 2.
C) estimated change in y when x increases by 1 unit.
D) intercept where the response surface strikes the x-axis.