Mod 32 Assessing Intelligence Binet: 1st modern intelligence, France—identify children who weren’t up to same “mental status” as peers; very afraid of test being used to “label” students Mental age: the intelligence level you measure at that corresponds w/a chronological age Binet did not care WHY this was your mental age US Terman (Stanford) adapted the Binet test for Americans---Stanford-Binet IQ (intelligence quotient): mental age / chronological age x 100 IQ 100 average IQ 85 to 110 are a standard normal (2/3rds of the population) ***not really acceptable for adults….as you get older, technically your IQ would diminish according to this scale Terman believed that IQ scores supported concept of eugenics—encourage only smartest & mentally fit to reproduce (those who were Western European in origin) IQ for the army—Alpha test (verbal) Beta (nonverbal) Obj 2 Modern Test Weschler WAIS (scale) most widely used test—adults; several different components—verbal, perceptual org., performance, tests for time of answer as well—could earn more points by answering faster Aptitude test; predict future performance (SAT) Achievement test: assess what you’ve already learned (AP, driving) Obj 3 Standardization 1st give test to a representative sample/pop—compare the sample scores to the people then taking the test Normal distribution: bell/normal curve—most of scores fall in the middle IQ 100 pts KNOW THE DIAGRAM & DISTRUBITON ON PAGE 446!! Do have re-standardized periodically Flynn effect: intelligence scores improved from the 1920’s an average of 10 points (ave. score was 76….) Could be due to education, nutrition, etc Obj 4 Reliability Consistent scores—retesting Split test reliability: give 1st odd questions, then give even quest IQ tests have +.9 correlation—very high Obj 5 Validity Test measures what it is supposed to Content validity: does it sample the behavior being tested? Criterion: does test predict the material it is testing on SAT has +.5 GRE +.3 Obj 6 Stability vs Change IQ scores don’t stabilize until around age 7 Obj 7 Extremes of Intelligence Mental retardation: limited mental ability (IQ of 70 & below) AND adapting life Down’s Syndrome: extra chromosome on 21st Used to keep mentally retarded children institutionalized—today mainstreaming Self-fulfilling prophecy