Question

To eliminate the possibility of hidden or unknown variables, the scientist must run a _______ experiment. A) control B) preliminary C) test D) variable

Answer 1

To eliminate the possibility of hidden or unknown variables, the scientist must run an A) Control experiment

Answer 2

Preliminary experiment. this would rule out any unknown variables. yes the experiment would have to be controlled but it would have to be preliminary because it has to be done to ensure there are no unknown variables