In the quadratic regression model y = β₀ + β₁X₁ + β₂X₁² + ε, if the term β₂ 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

Question

Quizplus · Accepted Answer

If the leading coefficient is positive, the parabola opens upward.

In the Quadratic Regression Model Y = β0 + β1X1

In the Quadratic Regression Model Y = β₀ + β₁X₁