If a student learned there is a quiz every Friday they will likely to do small bits of studying during the week and then drastically increase their studying right before the quiz. This is similar to behavior exibited by rats with a schedule of reinforcement.

Fixed-interval

Explanation:

Fixed-interval schedule of reinforcement is the reinforcement in which reward or benefit for first response is not provided until particular time has passed or certain time gap. Example- rat pushing the lever is rewarded at certain time.    

According to the question, students are also following fixed-interval schedule of reinforcement where they increase study before the quiz at certain time period for reward as success in quiz and study normally in small bit whole week.

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.

answer; to be the responsible party for healthcare delivery through medicare and medicaid programs;