What has the researcher determined when an experiment reveals that strength training is effective for building muscle mass only when paired with a high-protein diet?
A) A training by diet interaction
B) A main effect for diet
C) A main effect for training
D) No main effects

Question

Quizplus · Accepted Answer

The researcher has determined a training by diet interaction, as the effectiveness of strength training for building muscle mass is dependent on the participant's diet (specifically, a high-protein diet). There is no mention of a main effect for diet or training alone, so options B, C, and D can be ruled out.

What Has the Researcher Determined When an Experiment Reveals That