6.24 Technology for teaching statistics. The Brigham Young University statistics department performed randomized comparative experiments to compare teaching methods. Response variables include students’ final-exam scores and a measure of their attitude toward statistics. One study compared two levels of technology for large lectures: standard (overhead projectors and chalk) and multimedia. The individuals in the study were the eight lectures in a basic statistics course. There were four instructors, each of whom taught two lectures. Because lecturers differed, a block design was used with their lectures forming four blocks. Suppose the lectures and lecturers were as follows.

Use a diagram to outline a block design for this experiment. Figure 6.2 is a model.