Kwan checks his email for new messages several times during the day. He realizes that because emails are sent on a ________________ schedule, checking his email more frequently will not increase the number of new emails he receives in a day
Furthermore, he knows that he cannot predict when people will email him, but if an email has been sent to him, he will receive it the next time he checks.
A) fixed-ratio
B) fixed-interval
C) variable-ratio
D) variable-interval
Answer: D
Rationale: On a variable-interval schedule, the first response is reinforced following a variable amount of time.
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