As used in this chapter, "student teacher" or "intern" shall mean a student enrolled in an institution of higher learning approved by the state board of education for teacher training and who is jointly assigned by such institution of higher learning and a board of education to student-teach or intern under the direction of a regularly employed certificated teacher, principal, or other administrator. Whenever in this chapter "board of education" is referred to and the school that a student teacher or intern is assigned to does not have a board of education, such term shall refer to the person or governing body that administers such school.