Two Teachers Who Are Friends Teach Math at Different High

Multiple Choice

Two teachers who are friends teach math at different high schools. At a conference they learn about a new program for teaching trigonometry. They decide to test it by having one teacher use it in her class and the other use the traditional program. At the end of the school year they compare their students' scores on the AP trigonometry test. This is an example of which research design?

A) One-group posttest-only design
B) One-group pretest-posttest design
C) Posttest-only design with nonequivalent groups
D) Nonequivalent posttest-only design