Dr Smart Has Conducted a Research Study on a New

Multiple Choice

Dr. Smart has conducted a research study on a new reading strategy in two classrooms. She tested all students' reading abilities, used the new reading strategy with the one of the classrooms for a quarter, and then tested the reading abilities of the students in both classrooms at the end of the quarter. She adjusted her posttest scores because the students in the control classroom (who were not taught with the new reading strategy) scored higher on their pretests. This is an example of:

A) A double-blind procedure
B) Analysis of covariance
C) Holding an extraneous variable constant
D) Counterbalancing