Answer :
Answer:
variable-interval
Explanation:
In psychology, a variable-interval schedule is described as a schedule of reinforcement which is considered as one of the parts in the operant conditioning and was discovered by B. F. Skinner. It is also denoted as VI, and is defined as a process whereby "reinforcement" is being given to a specific response only after a well-defined amount of time has been passed i.e, unpredictable time and therefore the amount of time is supposed to be on a variable or changing schedule.
As per the question, studying for professor Wallace's surprise quizzes will be reinforced on a variable-interval schedule.