In Melody's class, she takes attendance on average every five to ten days, and students who are present receive extra points. Sometimes she will take attendance two or three days in a row, but she never lets the students know when this will happen. This is an example of what type of reinforcement schedule?

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This is a variable-interval schedule because the attendance is taken at unpredictable time intervals, ranging from every five to ten days, and sometimes consecutively, without a fixed pattern.

In Melody's Class, She Takes Attendance on Average Every Five