In the Quadratic Regression Model $\mathrm { y } = \beta _ { 0 } + \beta _ { 1 } X _ { 1 } + \beta _ { 2 } X _ { 1 } ^ { 2 } + \varepsilon$

Multiple Choice

In the quadratic regression model $\mathrm { y } = \beta _ { 0 } + \beta _ { 1 } X _ { 1 } + \beta _ { 2 } X _ { 1 } ^ { 2 } + \varepsilon$
If the term ?₂ is ___________ zero,then the parabola opens ____________.

A) Less than,upward
B) Greater than,upward
C) Greater than,either upward or downward
D) Less than,either upward or downward
E) Equal to,downward