Professor Robinson Found That Students Who Sit in the Front

Essay

Professor Robinson found that students who sit in the front row of his class receive better grades than students who sit in the back row of his class. Before he jumps to the conclusion that students in the front are smarter than those who sit in the back, he remembers that correlation does not equal causation. What are some extraneous variables that may explain the observed relationship between where a student sits and his/her class performance?