A class of third graders is told that the assistant principal will be visiting the class to confirm their teacher's reports of bad behavior. When the principal visits, the students behave perfectly. This is an example of .

The Hawthorne Effect      

Explanation:

Hawthorne effect: In psychology, the Hawthorne effect was proposed by one of the researchers named Henry A. Landsberger during the 1950s, and is described as a phenomenon whereby a person is determined to alter or change his or her behavior in regards of being observed and generally signifies positive changes or alteration.

Therefore, the Hawthorne effect is also being utilized in the "organizational psychology" to signify different worker's behavioral change being observed.

The question above is an example of the Hawthorne effect.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.