Karen Wants to Use a Categorical Variable, Levels of Education

Multiple Choice

Karen wants to use a categorical variable, levels of education, to predict annual income. There are six categories in the levels of education: High school graduate, Some college, Associate's degree, Bachelor's degree, Master's degree, Doctorate, or professional degree. How many categories need to be dummy coded and included in the regression model as predictors?

A) 4
B) 5
C) 6
D) 7