Professor Montgomery Is Interested in Testing the Utility of a New

Multiple Choice

Professor Montgomery is interested in testing the utility of a new teaching technique but is worried that individual differences between her students' levels of comprehension of the course material may affect her outcomes. How might she reduce this concern?

A) Use random sampling.
B) Use random assignment.
C) Use another professor's students.
D) Examine only students who are already doing well in the class.