The US exports more than it imports regarding its balance of trade with China. TRUE OR FALSE?

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; i believe the answer is 80%, plz check first good luck;