Speed of response is correlated with iq scores.

answer; i had to look this up and the only one i found was(last only 15 minutes) plz check first and good luck;

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.