What Technique Or Approach Can Be Employed In Order To Maximize The Likelihood That Experimental And Control Groups Are Similar Before Any Treatment Is Begun?

What Technique Or Approach Can Be Employed In Order To Maximize The Likelihood That Experimental And Control Groups Are Similar Before Any Treatment Is Begun? Random assignment minimizes preexisting differences between the experiemental group and the control group. The independent variable is the factor you manipulate to study its effect. What technique is used to