Ehesef said:
I'd like to know how they collect that data.
http://www.publicschoolreview.com/private-public-schools.php
Private and Public School Statistics
Now that we understand some of the main factors that families consider when deciding whether to enroll their children in private or public school, let’s look at the facts. Here are statistics on both private and public schools in America:
Academic Programs
Public schools offer a general program, designed for all. This usually includes math, English, reading, writing, science, history and physical education. In addition, many public schools offer programs in music and art too. What students learn is decided by the state. In most states, learning is measured through standardized tests. The content and minimum achievement criteria in each course offered in public high schools are put forward by the state and each student must achieve this minimum criterion before receiving credit. The charter school movement is also picking up momentum in many states; these schools are public, but offer specialized programs and smaller classes. There are not that many charter schools in the United States. According to the Center for Education Reform, there are approximately 3,400 public charter schools in America as of 2005. Charter schools are often closed if their students do not show academic progress. According to a report by educationnext.org, there were 3,100 magnet schools in America as of 2001/2002.
Private schools have the flexibility to create specialized programs for students. For example, private schools may use art or science in all classes, or take children on outdoor trips. They can create their own curriculum and assessment systems, although many choose to use standardized tests. Many parents are drawn to the alternative curriculums that private schools have to offer.
Private school students generally perform higher than their public school counterparts on standardized achievement tests. As with earlier results from the National Assessment of Educational Progress (NAEP), private school students performed higher than public school students on the NAEP: 2000 tests. Their average scores were above those of public school students on the 4th-grade reading test and on the 4th-, 8th-, and 12th-grade science and mathematics proficiency tests.
Private high schools typically have more demanding graduation requirements than do public high schools. Compared with public schools, private schools required more coursework (in 4-year high school programs) in 1999–2000 in social studies, mathematics, science, foreign language, and computer science. For example private schools required on average 3.1 years of mathematics, while public schools required 2.7 years. The figures for foreign language study also differed: 1.5 years at private schools but 0.5 years at public schools. In addition, about 40 percent of private schools required some form of community service for high school graduation, four times the rate for public schools (10 percent).
Private school students are more likely than public school students to complete a bachelor’s or advanced degree by their mid-20s. Data from the National Education Longitudinal Study of 1988, "Fourth Follow-up" (NELS: 1988/2000) show that students who had attended private school in 8th grade were twice as likely as those who had attended public school to have completed a bachelor’s or higher degree by their mid-20s (52 versus 26 percent) and far less likely to not complete a post-secondary education.