A Dummy Variable in a Multiple Regression Analysis Is

Multiple Choice

A dummy variable in a multiple regression analysis is

A) an unmeasured variable that is excluded from the underlying causal model.
B) an uncontrolled variable that creates a spurious relationship.
C) an uncontrolled variable that intervenes or "mediates" a relationship.
D) a variable with values of 0 and 1 used to represent a nominal- or ordinal-scale variable.