What schedule of reinforcement is the manager using? A manager of a doll factory sits in his office most of the day.  However, a few times per day he will randomly walk out onto the factory floor and provide praise to each worker who assembles a doll. 

Variable interval

Correct Answer: Variable Interval. Since the manager goes out onto the floor of the factory randomly throughout the day, and reinforces the first correct response at that time, it is a variable interval schedule or reinforcement. It is not a fixed ratio schedule because although the first response was reinforced and it appears to be an FR1 schedule, it actually is not since previous responses in the absence of the manager were not reinforced. Fixed interval is incorrect since the manager goes out on the factory floor at random times. Variable Ratio is incorrect since the reinforcement is on a ratio schedule.*##**##*