A Texas school district wants to compare the effectiveness of a standard AP Statistics curriculum and a new "hands-on" AP Statistics curriculum. Two experienced teachers, Mr. Pryor and Mr. Legacy each teach one class with the standard curriculum and one with the new approach. Students are assigned at random to these four classes. At the end of the year, all students take the AP Statistics exam.
The Texas experiment has
A. one factor: the AP Statistics curriculum a student is assigned to.
B. has two factors: the AP Statistics curriculum and the teacher a student is assigned to.
C. has two factors: the standard curriculum and one with the hands-on approach.
D. has three factors: the math curriculum, the teacher, and the class a student is assigned to.
E. has three factors: the standard curriculum, the hands-on approach, and the teacher a student is assigned to.
Answer: A