SCENARIO 4 Typically, you check your email at random times throughout the day instead of checking every time a single message is delivered. The thing about email is that in most cases, you never know...

Determine if it is a fixed ratio, variable ratio schedule, fixed interval schedule, or variable interval schedule.

Extracted text: SCENARIO 4 Typically, you check your email at random times throughout the day instead of checking every time a single message is delivered. The thing about email is that in most cases, you never know when you are going to receive a message. Because of this, emails roll in sporadically at completely unpredictable times. When you check and see that you have received a message, it acts as a reinforcer for checking your email. Fixed Ratio Variable-Ratio Fixed-Interval Variable-Interval (VI) SCENARIO 5 • Your psychology instructor might issue periodic pop quizzes to test your knowledge and to make sure you are paying attention in class. While these exams occur with some frequency, you never really know exactly when he might give you a pop quiz. One week you might end up taking two quizzes, but then go a full two weeks without one. Because you never know when you might receive a pop quiz, you will probably pay attention and stay caught up in your studies to be prepared.