Jose is a history student. In one of his research papers, he quotes a well-known anthropologists opinion on the human race to validate his research but does not mention the source of the quote. In this scenario, Jose is involved in the act of .

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

answer; ///self- learning;