Question

you call a friend on the phone and repeatedly get sent to voicemail, so you continue to call her every 5 - 20 minutes hoping to speak to her personally. which reinforcement schedule is this?
o fixed interval
o fixed ratio
o variable interval
o variable ratio

Explanation:

In a variable - interval schedule, reinforcement is available after an unpredictable amount of time has passed. Here, you call your friend every 5 - 20 minutes (an unpredictable time interval), hoping for a response (reinforcement). In a fixed - interval schedule, the time between reinforcements is constant. In fixed and variable ratio schedules, reinforcement is based on the number of responses, not time.

Answer:

variable interval