Why impact studies are important​

Impact studies determine one important factor: change. New policies are implemented to foster a change within the system to benefit individuals or an organisation. They measure the result of change from new policy. These types of studies inform policy makers about potential economic, social, and environmental effects

Explanation:

the rebels’ chances of victory at lexington & concord were fairly slim, given the fact that most of them very untrained and they were up against the world's greatest military force.  

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.