The Model Y = β₀ + β₁x₁ + β₂x₂

Multiple Choice

The model y = β₀ + β₁x₁ + β₂x₂ + β₃x₁x₂ + ε is a __________.

A) second order polynomial model
B) concave model
C) linear model with interaction
D) convex model
E) quadratic model