Dr. Kalmagura plans on introducing a new exam review procedure in his chemistry classes. To check the effectiveness ofthe new procedure he is going to have half his students try the new technique for one semester, while the remaining students review in the way they have always done in the past. He asks each student to decide which of the techniques they would like to use, the new technique or the standard technique. In this example, Dr. Kalmagura's procedure ilJustrates:.a. the use of non-random assignment. b. a correlational research design. c. a double-blind research design. d. what is meant by informed consent in research.