Yogi wants to find out whether campers prefer cotton or nylon sleeping bags. he asks a group of girl campers to try the nylon sleeping bags and a group of males to try the cotton sleeping bags. the sleeping bags were rated for softness and warmth. what is the confounding variable in yogi's experiment?

The correct answer is the gender of the camper.
A confounding variable is something external which may affect, change, and influence the dependent and independent variables. In Yogi's case, the gender of the camper is that confounding variable given that men and women won't react the same way to the softness and warmth of these sleeping bags.