A researcher is concerned that gender may affect how participants respond to an experimental stimulus. so participants are paired with another participant who has the same gender, and one member from each pair is assigned by a flip of a coin to the experimental group and one to the control group. this method of assigning subjects to groups is called:

• queеn: Researchers are concerned that gender may affect how participants respond to experimental stimuli. Participants are paired with another participant with the same gender, one member from each pair puts a coin in the experiment group and is assigned one to the control group.