A researcher would like to study the relationship between y = graduating GPA of students at a university and x = major field of study (1 = science, 2 = humanities, etc.). What is a possible difficulty with using a regression line to analyze these data?
A) Presence of one or more outliers
B) Inappropriately combining groups
C) Curvilinear data
D) Explanatory variable is not quantitative

Question

Quizplus · Accepted Answer

The explanatory variable (major field of study) is categorical, not quantitative, which makes it inappropriate for analysis using a regression line that assumes a quantitative relationship between variables.

A Researcher Would Like to Study the Relationship Between Y