High School Students from Low-Income Families Sometimes Work After School

Multiple Choice

High school students from low-income families sometimes work after school to bring in extra income .Because of the hours they spend working, they have less time to do homework, which can lead to poorer grades .A researcher explores the effect of family income on grades .What type of variable is working part time in this study?

A) Common cause
B) Intervening variable
C) Control variable
D) None of the above