The radio DJ says, "Sometime this hour, I'll be giving away a pair of tickets to the Ariana Grande concert to one lucky caller." This is an example of which type of reinforcement schedule?

Variable interval

Explanation:

Variable interval is one of method that people can use to give a certain reinforcement (punishment or reward) .  The reinforcement will be given in a uncertain timing so the subjects will have no idea when the reinforcement will be given.

This can be seen in situation above.

The DJ said , "Sometime this hour, I'll be giving away a pair of tickets to the Ariana Grande concert to one lucky caller."

He did not give a specific time to give the reward (in this case, the ticket is considered as the reinforcement)

3,500 beverages

explanation:

24 years, i believe is the correct answer.