It is declared to be the legislative purpose of this chapter, and the public policy of the State of Mississippi, that there be established and developed in the public interest an educational television and radio system which shall provide educational and instructional, professional growth, and public service programs for the students and citizens of Mississippi, such system to be known as Mississippi Educational Television. The legislature therefore declares and determines that for these and other related purposes there is hereby established an agency of state government to be known as the Mississippi authority for educational television which shall have the responsibility for the administration, operation, control and supervision of educational television and radio in Mississippi.