Final answer:
The child is trying to learn to drink from the cup using the process of observational learning.
Step-by-step explanation:
When a child first sucks on a sippy cup in the same way the child has already learned to suck from a bottle, the child is trying to learn to drink from the cup using the process of observational learning.
Observational learning is a form of learning through observing others and imitating their behavior. In the example of the chimpanzees and the juice boxes, the chimpanzees in the first group learned a more efficient way to drink from the straw by observing and modeling the behavior of the chimpanzees in the second group.
Similarly, when a child tries to use a sippy cup in the same way they have learned to suck from a bottle, they are imitating the behavior they have observed and learned from the bottle.