Though sometimes it's a little early or a little late, your mail almost always arrives around 10:30 every morning. As it gets closer to 10:30, you tend to check the mailbox more often. This is an everyday example of a variable-interval schedule of reinforcement.

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Quizplus · Accepted Answer

A variable-interval schedule of reinforcement is when behavior is rewarded after an unpredictable amount of time has passed. In this scenario, the delivery of mail varies slightly but generally occurs around the same time each day, creating a variable-interval schedule of reinforcement.

Though Sometimes It's a Little Early or a Little Late