Nadine Conducted a Pretest-Posttest Control Group Design

Multiple Choice

Nadine conducted a pretest-posttest control group design. The comparison group received traditional lecture of course content while the treatment group received the lecture and instructor-provided summary notes. She found, however, no differences between conditions, due in part to students sharing the instructor summaries across conditions. This is an example of

A) compensatory rivalry.
B) treatment diffusion.
C) placebo effect.
D) experimenter effects.