"Pavlov's dog" experiments with bell ringing as the association, operating on food being served after the bell's chime, involved him measuring the dogs' salivation quantity as a result. It was a study on classical conditioning.
He showed that two things become associated because there is anticipation of reward.
Disabled students, they are the group that is being researched to find ways to keep that group of students in the general ed class.
The answer to that would be 4000 pounds :)
