<span> The </span>Articles of Confederation <span>served as the written document that established the functions of the national government of the United States after it declared independence from Great Britain.</span>
I believe the answer is: The control group would be cars that were washed by hand
The control group exist in order to measure the result that created by subjects that recieve specal treatment (the special treatment in this case would be the automated car wash).
In the example above, the result from automatic car wash would be controlled by comparing it to the result from handwashed cars.
