Answer:
Independent: electronics in room
Dependent: hours of sleep
Control: school nights, night routine, lighting of room, the time the person decides to go to bed
Confounding: the person(?? not entirely sure on this one)
Answer:
It is most likely going to be C. Susan is on a fixed-ratio schedule of reinforcement.
Explanation:
Eggs do not grow, they are produced by other animals. Such as chickens.