When training a pigeon to push a lever, an experimenter provides the pigeon with a reward after a certain amount of time. However, the amount of time between rewards is randomly chosen. What kind of schedule of reinforcement is the experimenter using?

The kind of schedule of reinforcement the experimenter is using is the variable interval schedule

Explanation:

A schedule of reinforcement is a practice that a teacher follows to control the timing and frequency of reinforcement and as a result gets a behavior or response from a target. Schedules can sometimes be continuous or intermittent. In Variable interval schedule, reinforcement occurs after an unpredictable or random amount of time. Best example to explain Variable interval schedule is someone who constantly checks his or her emails for a job response. They do not know when they will be rewarded with the email but continue to check until they do. In this case, the Pigeon gets a reward based on varying amounts of time, which are not certain and are unpredictable.

the above statement/question is (true);