38. In the quadratic regression model y=b0+b1X(1)+b2X2(1)+E the b1 term represents the:

A. Rate of curvature of the parabola.

B. Value of Y when X is zero.

C. Shift parameter of the parabola.

D. Y-intercept of the parabola.

39. In the quadratic regression model y=b0+b1X(1)+b2X2(1)+E the b2 term represents the:

A. Rate of curvature of the parabola.

B. Value of Y when X is zero.

C. Shift parameter of the parabola.

D. Y-intercept of the parabola.

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