SAT:
Standardized test taken by U.S. high school students applying to colleges. It is divided into two principal sections, verbal and mathematical. Promulgated largely through the efforts of James B. Conant as a means of promoting merit-based (rather than class-based) college admissions, it was administered to few students before the end of World War II but by the end of the 20th century was taken by millions each year. Scores declined as the test came to be more widely administered, and in 1995 the score of 500 for each section (midway between the extremes of 200 and 800) was reestablished as the actual mean score of those tested. The test, which most colleges use as one measure of an applicant's ability, has been denounced as biased in favor of men and the white middle class. Other critics claim that the SAT is inadequate for testing various important capacities.
ASVAB: The Armed Services Vocational Aptitude Battery (ASVAB) is a multiple choice test, administered by the United States Military Entrance Processing Command, used to determine qualification for enlistment in the United States armed forces. It is often offered to American high school students when they are in the 11th grade, though anyone eligible to and interested in enlisting can take it. The ASVAB was first introduced in 1968 and was adopted by all branches of the military in 1976. In 2002 it underwent a major revision. In 2004, the test's percentile ranking scoring system was re-normalized, to ensure that a score of 50% really did represent doing better than exactly 50% of test-takers. ASVAB scoring is based on an Item Response Theory (IRT) model. IRT is a theory that enables test questions and examinee abilities to be placed on the same scale, thereby allowing tests to be tailored to the specific ability level of each examinee and scores to be expressed on the same scale regardless of the combination of items that are taken. Examinees also receive a score on what is called the Armed Forces Qualification Test (AFQT). AFQT scores are computed using the Standard Scores from four ASVAB subtests: Arithmetic Reasoning (AR), Mathematics Knowledge (MK), Paragraph Comprehension (PC), and Word Knowledge (WK). AFQT scores are reported as percentiles between 1-99. An AFQT percentile score indicates the percentage of examinees in a reference group that scored at or below that particular score. For current AFQT scores, the reference group is a sample of 18 to 23 year old youth who took the ASVAB as part of a national norming study conducted in 1997. Thus, an AFQT score of 90 indicates that the examinee scored as well as or better than 90% of the nationally-representative sample of 18 to 23 year old youth. An AFQT score of 50 indicates that the examinee scored as well as or better than 50% of the nationally-representative sample.
Sources: answer.com
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