Wyoming supports a single state university. Public universities often have large student bodies, with introductory classes numbering in the hundreds, with some undergraduate classes taught by graduate students. Tribal colleges operated on Indian reservations by some federally recognized tribes are also public institutions. Many private universities exist. Some are secular and others are involved in religious education. Some are non-denominational, and some are affiliated with a certain sect or church, such as Roman Catholicism (with different institutions often sponsored by particular religious institutes such as the Jesuits) or religions such as Lutheranism or Mormonism. Seminaries are private institutions for those preparing to become members of the clergy. Most private schools (like all public schools) are non-profit, although some are for-profit. Community colleges Community colleges are often two-year colleges. They have open admissions, usually with lower tuition fees than other state or private schools. Graduates earn associate degrees, such as an Associate of Arts (AA). According to National Student Clearinghouse data, community college enrollment has dropped by 2.2 million students since its peak year of 2010–11. In 2017, 88% of community colleges surveyed were facing declining enrollments. A The New York Times report in 2017 suggested that of the nation's 18 million undergraduates, 40% were attending community college; of these students, 62% were attending community college full-time, 40% of them worked at least 30 hours a week or more, and more than half lived at home to save money. The College Promise program, which exists in several forms in 47 states, is an effort to encourage community college enrollment. Liberal arts colleges Four-year institutions emphasizing the liberal arts are liberal arts colleges. They traditionally emphasize interactive instruction. They are known for being residential and for having smaller enrollment and lower student-to-faculty ratios than universities. Most are private, although there are public liberal arts colleges. Some offer experimental curricula. Academic areas that are included within the liberal arts include great books, history, languages including English, linguistics, literature, mathematics, music, philosophy, political science, psychology, religious studies, science, environmental science, sociology and theater. For-profit colleges For-profit higher education (known as for-profit college or proprietary education) refers to higher education institutions operated by private, profit-seeking businesses. Students were "attracted to the programs for their ease of enrollment and help obtaining financial aid," but "disappointed with the poor quality of education...." University of Phoenix has been the largest for-profit college in the US. Since 2010, for-profit