Fixed-Ratio

George spends 45 minutes surfing the internet everyday when he get home at 3:30 pm. The reinforcer is using the internet

Variable-Ratio

Henry goes hunting everyday for a week, hoping to see a deer. The reinforcer is a deer appearing

Fixed-Interval

School starts everyday at 7:45. The reinforcer is school beginning.

Variable-Interval

Jude turns his car heater on, hoping it will be warm by the time he starts driving.

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