ACHIEVEMENT TEST -- a test which measures acquisition of knowledge or shill.
APTITUDE TEST -- a test used to predict success or failure in an undertaking.
COEFFICIENT OF CORRELATION -- the numerical index used to indicate the degree of correlation between two sets of paired measurements. Correlation coefficients range from + 1 for a perfect positive correlation to 1 for a perfect negative correlation.
CORRELATION -- the degree of correspondence between two sets of paired measurements.
CULTURE-FAIR TEST -- a test that avoids items in which the different experiences of various cultural groups affect the total score.
FACTOR ANALYSIS -- a statistical procedure used to identify the elements that make up any complex trait.
FREQUENCY DISTRIBUTION -- a set of scores assembled according to size and grouped into class intervals.
FREQUENCY POLYGON -- the graph in which frequencies are represented by points and points are connected by a line.
G-FACTOR -- a general ability underlying test scores. especially those of intelligence, as distinct from special or unique abilities. GIFTED CHILDREN -- children with IQ's over 130.
INTELLIGENCE -- what intelligence tests measure.
INTELLIGENCE QUOTIENT (IO) -- the ratio of a person's mental age (MA) to his chronological age (CA) multiplied by 100. 60
MEAN -- a measure of central tendency; the arithmetical average.
MEDIAN -- a measure of central tendency; the mid-point of the distribution; the point above which and below which exactly half (50%) of the scores lie.
MENTAL RETARDATION IQ below 70
MILD RETARDATION -- IQ 53-69.
MODE -- a measure of central tendency. The value that occurs most frequently.
MODERATE RETARDATION -- IQ 36-52.
NATURE-NURTURE CONTROVERSY -- the question of the relevant importance of heredity and environment in influencing human development.
NORMAL CURVE -- a bell-shaped frequency polygon
PERCENTILE -- a value on a scale of 100 that indicates the percent of the distribution that is equal to or below it. Example: a score of 85 is a score equal to or better than 85% of the scores.
PROFOUND RETARDATION -- IQ below 20.
RELIABILITY -- the degree to which repeated measures on the same subjects give the same results.
RETARDED -- anyone with an IQ less than 70.
SCATTER PLOT -- a graph that is used to show the relationship between two sets of scores.
SEVERE RETARDATION -- IQ 20-35.
VALIDITY the degree to which a test measures what it claims to measure.