Sec. 15. "Private technical, vocational, correspondence, and trade school" means an institution or agency offering course or courses of instruction for a fee or fees and that is not primarily supported by public tax funds. The term does not include the following:
(1) A college or university offering a course of study leading to a bachelor's degree.
(2) A nonpublic preschool, elementary, or secondary school that is approved by the department of education.