*All other factors being equal, who would most consistently be able to deliver at a peak performance level?

answer; ///i believe that the correct answer is because the house and senate frequently pass different versions of the same bill;

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.        

i believe that the answer to the question provided above is that the role of campaign committees is to act as a bridge between state and local campaigns.