Answer Happy

What is the purpose of adding a quadratic term of an independent variable in a linear regression? O To account for relationships between the dependent (y) and an independent variable (x) that change direction (e.g., the relationship is positive for small values of x, but tends to become negative for larger values of x). To account for omitted-variable bias. To make the predicted dependent variable to have only negative values. To make the predicted dependent variable to have only positive values.