A radio DJ frequently announces how much money is currently in a jackpot. Every day several randomly selected residents are called and asked to identify the amount, and thereby win it. Those who keep track of the jackpot amount are most likely to be reinforced on a schedule.

"Variable interval" is the right solution.

Step-by-step explanation:

A variable-interval timetable seems to be a fiber-reinforced routine where another sensitivity or reaction would be commended because an unanticipated or unstable transaction has taken place, which would be the exact reverse of either a fixed-interval routine. The whole such schedule results in a slow or predictable, fairly constant targeted respondents.

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