What is the ideal number of variables for the experimenter to alter at one time? Group of answer choices 0 - with change comes uncertainty 1 - so I have the possibility of assigning the effects to as few causes as possible 2 - if I change the dependent variables myself, I can be more certain of the results. unknown - it depends on the experiment as many as possible - experiments can be costly, I can give up a little certainty in exchange for time and money