Kathy Trains Nurses

Multiple Choice

Kathy trains nurses. She designed a new assertive communication unit to include in her training. She administers a pretest and then randomly assigns nurses to her treatment or a control condition. She tests their communication skills after the treatment. She sees significant differences at immediate testing but after eight weeks she retests the nurses and finds no differences between her treatment and control students.
-It appears Kathy should be most concerned with which of the following threats to her study?

A) Participant effect
B) Researcher effect
C) Novelty effect
D) Placebo effect