In 1997, a study of 5,402 homeschool students from 1,657 families was released.
The study demonstrated that homeschoolers, on the average, out-performed their counterparts in the public schools by 30 to 37 percentile points in all subjects. ----
This was confirmed in another study by Dr. Lawrence Rudner of 20,760 homeschooled students which found the homeschoolers who have homeschooled all their school aged years had the highest academic achievement. This was especially apparent in the higher grades.
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Another important finding of Strengths of Their Own was that the race of the student does not make any difference. There was no significant difference between minority and white homeschooled students. For example, in grades K-12, both white and minority students scored, on the average, in the 87th percentile. In math, whites scored in the 82nd percentile while minorities scored in the 77th percentile. In the public schools, however, there is a sharp contrast. White public school eighth grade students, nationally scored the 58th percentile in math and the 57th percentile in reading. Black eighth grade students, on the other hand, scored on the average at the 24th percentile in math and the 28th percentile in reading. Hispanics scored at the 29th percentile in math and the 28th percentile in reading.
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The average cost per homeschool student is $546 while the average cost per public school student is $5,325. Yet the homeschool children in this study averaged in 85th percentile while the public school students averaged in the 50th percentile on nationally standardized achievement tests.
Similarly, the 1998 study by Dr. Rudner of 20,760 students, found that eighth grade students whose parents spend $199 or less on their home education score, on the average, in the 80th percentile. Eighth grade students whose parents spend $400 to $599 on their home education also score on the average, in the 80th percentile! Once the parents spend over $600, the students do slightly better, scoring in the 83rd percentile.
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In a study released by the National Center for Home Education on November 10, 1994. According to these standardized test results provided by the Riverside Publishing Company of 16,311 homeschoolers from all 50 states K-12, the nationwide average for homeschool students is at the 77th percentile of the basic battery of the Iowa Test of Basic Skills. In reading, the homeschoolers' nationwide grand mean is the 79th percentile. This means, of course, that the homeschool students perform better in reading than 79 percent of the same population on whom the test is normed. In the area of language arts and math, the typical homeschooler scored in the 73rd percentile.
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In 1991, a survey of standardized test scores was performed by the Home School Legal Defense Association in cooperation with the Psychological Corporation, which publishes the Stanford Achievement Test (SAT). The study involved the administering of the Stanford Achievement Test (8th Edition, Form J) to 5,124 homeschooled students. These students represented all 50 states and their grades ranged from K-12. This testing was administered in Spring 1991 under controlled test conditions in accordance with the test publisher's standards. All test administers were screened, trained, and approved pursuant to the publisher's requirements. All tests were machine-scored by the Psychological Corporation.
These 5,124 homeschoolers' composite scores on the basic battery of tests in reading, math, and language arts ranked 18 to 28 percentile points above public school averages.
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In Pennsylvania, 171 homeschooled students took the CTBS standardized achievement test. The tests were all administered in group settings by Pennsylvania certified teachers. The middle reading score was the 89th percentile and the middle math score was the 72nd percentile. The middle science score was the 87th percentile and the middle social studies score was the 81st percentile. A survey conducted of all these homeschool families who participated in this testing found that the average student spent only 16 hours per week in formal schooling (i.e., structured lessons that were preplanned by either the parent or a provider of educational materials).
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For example, the 2,219 students reporting their homeschool status on the SAT in 1999 scored an average of 1083 (verbal 548, math 535), 67 points above the national average of 1016. In 2004 the 7,858 homeschool students taking the ACT scored an average of 22.6, compared to the national average of 20.9.
According to the 1998 ACT High School Profile Report, 2,610 graduating homeschoolers took the ACT and scored an average of 22.8 out of a possible 36 points. This is higher than the national average, which was 21.0 in both 1997 and 1998.