Question 1
Argument: The new traffic light at Main Street will reduce accidents because it will control the previously dangerous intersection.
Consider the assumption: 'The light will be properly maintained'
If we negate this assumption (assume the opposite), does it break the argument?
Yes — A malfunctioning light could increase accidents
Negation test: If 'The light will NOT be properly maintained' then the argument 'fails'.
Negation test: If 'The light will NOT be properly maintained' then the argument 'fails'.